SATHEE: Quantitative Aptitude Ques 1447

Quantitative Aptitude Ques 1447

Question: Simple interest on a certain sum is 16/25 of the sum. The rate per cent, if the rate per cent and time (in years) are equal, is

Options:

A) 6%

B) 8%

C) 10%

D) 12%

Show Answer

Answer:

Correct Answer: B

Solution:

Let the sum, $ P=x $ Then, $ SI=\frac{16}{25}x $ and $ t=r $ [given] By the formula, $ SI=\frac{P\times r\times t}{100} $

$ \Rightarrow $ $ \frac{16}{25}x=\frac{x\times r\times t}{100} $

$ \Rightarrow $ $ r^{2}=64 $
$ \Rightarrow $ $ r=64 $

$ \Rightarrow $ $ r=8% $ per annum Alternate Method If SI is $ \frac{x}{y} $ part of the principal P at the rate of r% per annum in $ tyr, $ also $ t=r $ Then, $ t=r=\sqrt{\frac{x}{y}\times 100} $ Here, $ \frac{x}{y}=\frac{16}{25} $

$ \Rightarrow $ $ r=\sqrt{\frac{16}{25}\times 100} $ $ =\sqrt{64}=8 $ %per annum

Quantitative Aptitude Ques 1446

Quantitative Aptitude Ques 1448

Quantitative Aptitude Ques 1447

Question: Simple interest on a certain sum is 16/25 of the sum. The rate per cent, if the rate per cent and time (in years) are equal, is

Options:

Answer:

Solution:

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