At simple interest a sum of Rs.64 becomes Rs.83.20 in 2 yr.

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RRB TA Exam (Chennai) 2008 click here to view all questions

At simple interest a sum of Rs.64 becomes Rs.83.20 in 2 yr. What will Rs.86 become in 4 yr at the same rate of interest?

ARs.129.40

BRs.137.60

CRs.142.30

DRs.144.80

Nithin K ? Dec 3 '2016 at 19:47

Answer : Rs.137.60

Explanation:

Formula:    \(S.I. = \frac{P \times T \times R}{100}\)

P=Rs. 64,

S.I. = Rs. (83.20 - 64) = Rs. 19.20,

T = 2 years.

So, rate R = \(\frac{SI \times 100}{P \times T}\)=\(\frac{ (100 \times 19.20 ) \% }{64 \times 2} = 15\%                       \)

Now, P = Rs.86, R= 15%, T = 4 years.

S.I. = \(\frac{Rs ( 86 \times 15 \times 14 )}{100} = Rs. 51.60                      \)

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Answer : Rs.137.60 Explanation: Formula:    \(S.I. = \frac{P \times T \times R}{100}\) P=Rs. 64, S.I. = Rs. (83.20 - 64) = Rs. 19.20, T = 2 years. So, rate R = \(\frac{SI \times 100}{P \times T}\)=\(\frac{ (100 \times 19.20 ) \% }{64 \times 2} = 15\%                       \) Now, P = Rs.86, R= 15%, T = 4 years. S.I. = \(\frac{Rs ( 86 \times 15 \times 14 )}{100} = Rs. 51.60                      \) Nithin K ? answered Dec 3 '2016 at 19:47 All Comments

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