John spent 40% of his earning last month on rent and 30% : GMAT Problem Solving (PS)
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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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Kudos [?]: 2 [1] , given: 0

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

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14 Mar 2013, 03:04
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88% (02:04) correct 12% (01:08) wrong based on 60 sessions

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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, 03:08, edited 1 time in total.
Edited the question and the tags.
Math Expert
Joined: 02 Sep 2009
Posts: 35841
Followers: 6828

Kudos [?]: 89717 [0], given: 10381

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

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14 Mar 2013, 03:11
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. Answer: B. Hope it's clear. _________________ Intern Joined: 07 Mar 2013 Posts: 6 Followers: 0 Kudos [?]: 2 [0], given: 0 Re: John spent 40% of his earning last month on rent and 30% [#permalink] ### Show Tags 14 Mar 2013, 03:15 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 ?
Math Expert
Joined: 02 Sep 2009
Posts: 35841
Followers: 6828

Kudos [?]: 89717 [0], given: 10381

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

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14 Mar 2013, 03:18
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. Answer: B. 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.
_________________
Re: John spent 40% of his earning last month on rent and 30%   [#permalink] 14 Mar 2013, 03:18
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# John spent 40% of his earning last month on rent and 30%

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