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The number of coronary-bypass operations performed in the United State

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The number of coronary-bypass operations performed in the United State  [#permalink]

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New post 03 Jul 2017, 11:42
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Question Stats:

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The number of coronary-bypass operations performed in the United States increased from 13,000 in 1970 to 191,000 in 1983. What was the approidmate percent increase in the number of coronary-bypass operations from 1970 to 1983 ?

(A) 90%
(B) 140%
(C) 150%
(D) 1,400%
(E) 1,600%

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Re: The number of coronary-bypass operations performed in the United State  [#permalink]

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New post 03 Jul 2017, 11:49
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carcass wrote:
The number of coronary-bypass operations performed in the United States increased from 13,000 in 1970 to 191,000 in 1983. What was the approidmate percent increase in the number of coronary-bypass operations from 1970 to 1983 ?

(A) 90%
(B) 140%
(C) 150%
(D) 1,400%
(E) 1,600%


Percent Change \(=(\) Change / Initial value \()* 100\)

Change \(= 191,000 - 13,000 = 178,000\)

Required Percent Increase \(= \frac{178,000}{13,000} * 100 = 1369.23\) % \(= > Approximately = 1,400\)%

Answer (D)...
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Re: The number of coronary-bypass operations performed in the United State  [#permalink]

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New post 03 Jul 2017, 11:59
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13 to 191
130 is 1000%
61 is closer to 52 (13*4)
Hence D


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Re: The number of coronary-bypass operations performed in the United State  [#permalink]

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New post 03 Jul 2017, 11:59
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Since 13000 becomes 191000, the approximate percentage increase is in excess of 1000%(10 times more)

Only Option D and E remain for careful analysis.
15 times more is 195000(1500%), but we are able to see that the difference, which is 178000 is less then 195000
Hence, we have an answer option which matches(Option D)
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Re: The number of coronary-bypass operations performed in the United State  [#permalink]

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New post 03 Jul 2017, 13:25
carcass wrote:
The number of coronary-bypass operations performed in the United States increased from 13,000 in 1970 to 191,000 in 1983. What was the approidmate percent increase in the number of coronary-bypass operations from 1970 to 1983 ?

(A) 90%
(B) 140%
(C) 150%
(D) 1,400%
(E) 1,600%


1970 ===> 13,000

1983 ===> 191,000

% Increase \(= 191,000 - \frac{13,000}{13,000} * 100\)


% Increase \(= \frac{178000}{130}\)


% Increase \(= \frac{17800}{13}\)

% Increase \(= ~ 1369\)
\(% Increase = 1400\) %

Hence, Answer is D
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Re: The number of coronary-bypass operations performed in the United State  [#permalink]

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New post 02 Oct 2018, 18:19
carcass wrote:
The number of coronary-bypass operations performed in the United States increased from 13,000 in 1970 to 191,000 in 1983. What was the approidmate percent increase in the number of coronary-bypass operations from 1970 to 1983 ?

(A) 90%
(B) 140%
(C) 150%
(D) 1,400%
(E) 1,600%


We use the percent change formula and substitute the appropriate values:

(New - Old)/Old x 100

(191,000 - 13,000)/13,000 x 100

178,000/13,000 x 100

178/13 x 100 ≈ 1,400%

Answer: D
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Re: The number of coronary-bypass operations performed in the United State &nbs [#permalink] 02 Oct 2018, 18:19
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