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# John spent 40% of his earning last month on rent and 30%

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Intern
Joined: 07 Mar 2013
Posts: 6

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John spent 40% of his earning last month on rent and 30% [#permalink]

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14 Mar 2013, 04:04
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John spent 40 percent of his earning last month on rent and 30 percent less than what he spent on rent to purchase a new dishwasher. What percent of last month's earning did John have left over?

(A) 30%
(B) 32%
(C) 45%
(D) 68%
(E) 70%

hey guys,
could someone solve this problem with step by step explanation, please?
[Reveal] Spoiler: OA

Last edited by Bunuel on 14 Mar 2013, 04:08, edited 1 time in total.
Edited the question and the tags.

Kudos [?]: 4 [1], given: 0

Math Expert
Joined: 02 Sep 2009
Posts: 41891

Kudos [?]: 129061 [0], given: 12190

Re: John spent 40% of his earning last month on rent and 30% [#permalink]

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14 Mar 2013, 04:11
musical33 wrote:
John spent 40 percent of his earning last month on rent and 30 percent less than what he spent on rent to purchase a new dishwasher. What percent of last month's earning did John have left over?

(A) 30%
(B) 32%
(C) 45%
(D) 68%
(E) 70%

hey guys,
could someone solve this problem with step by step explanation, please?

Say John's earning last month was \$100.

John spent 40 percent of his earning last month on rent --> \$40 on rent;
30 percent less than what he spent on rent to purchase a new dishwasher --> \$40*0.7=\$28 on the dishwasher.

Left over amount 100 - (40 + 28) = \$32.

Hope it's clear.
_________________

Kudos [?]: 129061 [0], given: 12190

Intern
Joined: 07 Mar 2013
Posts: 6

Kudos [?]: 4 [0], given: 0

Re: John spent 40% of his earning last month on rent and 30% [#permalink]

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14 Mar 2013, 04:15
Bunuel wrote:
musical33 wrote:
John spent 40 percent of his earning last month on rent and 30 percent less than what he spent on rent to purchase a new dishwasher. What percent of last month's earning did John have left over?

(A) 30%
(B) 32%
(C) 45%
(D) 68%
(E) 70%

hey guys,
could someone solve this problem with step by step explanation, please?

Say John's earning last month was \$100.

John spent 40 percent of his earning last month on rent --> \$40 on rent;
30 percent less than what he spent on rent to purchase a new dishwasher --> \$40*0.7=\$28 on the dishwasher.

Left over amount 100 - (40 + 28) = \$32.

Hope it's clear.

thank you Bunuel
my problem with this what is the \$40*0.7=\$28
what is the .7 ?

Kudos [?]: 4 [0], given: 0

Math Expert
Joined: 02 Sep 2009
Posts: 41891

Kudos [?]: 129061 [0], given: 12190

Re: John spent 40% of his earning last month on rent and 30% [#permalink]

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14 Mar 2013, 04:18
musical33 wrote:
Bunuel wrote:
musical33 wrote:
John spent 40 percent of his earning last month on rent and 30 percent less than what he spent on rent to purchase a new dishwasher. What percent of last month's earning did John have left over?

(A) 30%
(B) 32%
(C) 45%
(D) 68%
(E) 70%

hey guys,
could someone solve this problem with step by step explanation, please?

Say John's earning last month was \$100.

John spent 40 percent of his earning last month on rent --> \$40 on rent;
30 percent less than what he spent on rent to purchase a new dishwasher --> \$40*0.7=\$28 on the dishwasher.

Left over amount 100 - (40 + 28) = \$32.

Hope it's clear.

thank you Bunuel
my problem with this what is the \$40*0.7=\$28
what is the .7 ?

30 percent less than what he spent on rent to purchase a new dishwasher = 40 - 0.3*40 = 0.7*40.

Or: 30 percent less than what he spent on rent to purchase a new dishwasher means that he spent 70% of the rent on the dishwasher.

Hope it's clear.
_________________

Kudos [?]: 129061 [0], given: 12190

Director
Joined: 12 Nov 2016
Posts: 784

Kudos [?]: 35 [0], given: 164

Re: John spent 40% of his earning last month on rent and 30% [#permalink]

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21 Jun 2017, 06:21
musical33 wrote:
John spent 40 percent of his earning last month on rent and 30 percent less than what he spent on rent to purchase a new dishwasher. What percent of last month's earning did John have left over?

(A) 30%
(B) 32%
(C) 45%
(D) 68%
(E) 70%

hey guys,
could someone solve this problem with step by step explanation, please?

200(.4) = 80 on house keepiing
80 (.70) 56 dishwasher

200-136/200 = 32%

Thus
"B"

Kudos [?]: 35 [0], given: 164

Senior Manager
Joined: 28 Jun 2015
Posts: 300

Kudos [?]: 107 [0], given: 47

Concentration: Finance
GPA: 3.5
Re: John spent 40% of his earning last month on rent and 30% [#permalink]

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21 Jun 2017, 23:10
John spent 40% of the earnings on rent.

He also spent 30% less than that to purchase a dishwasher, so % amount spent on dishwasher = (100-30)% (40%) = 28%.

So, he was left with (100-28-40)% = 32% of his earnings.
_________________

I used to think the brain was the most important organ. Then I thought, look what’s telling me that.

Kudos [?]: 107 [0], given: 47

Re: John spent 40% of his earning last month on rent and 30%   [#permalink] 21 Jun 2017, 23:10
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# John spent 40% of his earning last month on rent and 30%

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