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In 1966 the operative mortality rate in open heart surgery at a certai

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In 1966 the operative mortality rate in open heart surgery at a certai  [#permalink]

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New post 27 Mar 2019, 08:17
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  55% (hard)

Question Stats:

61% (02:17) correct 39% (02:37) wrong based on 111 sessions

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In 1966 the operative mortality rate in open heart surgery at a certain hospital was 8.1 per 100 cases. By 1974 the rate had declined to 4.8 per 100 cases. If the rate declined by 20% from 1973 to 1974, by approximately what percent did it decline from 1966 to 1973?

a) 6%
b) 21%
c) 25%
d) 41%
e) 49%
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Re: In 1966 the operative mortality rate in open heart surgery at a certai  [#permalink]

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New post 27 Mar 2019, 10:15
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Rate declined by 20% from 1973 to 1974.
Means 4.8 of 1974 = 80% of 1973.
4.8 = 80/100*x
x = 6.
Now, decline from 1966 to 1973 = (6-8.1)/8.1*100 = 2.1/8.1*100 = 21/81*100 = 20/80*100 = 25%

C is the answer
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Re: In 1966 the operative mortality rate in open heart surgery at a certai  [#permalink]

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New post 25 Apr 2019, 17:48
4.8/0.8=48=8=6% in 1973. From 8.1-6.0=2.1% decline rate = 2.1/8.1=1/4
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Re: In 1966 the operative mortality rate in open heart surgery at a certai   [#permalink] 25 Apr 2019, 17:48
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In 1966 the operative mortality rate in open heart surgery at a certai

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