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In how many years will be ₹ 870 amount to ₹1,044, the rate of interest being 2 1/2% p.a.? - Mathematics

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Question

In how many years will be ₹ 870 amount to ₹1,044, the rate of interest being `2 1/2`% p.a.?

Sum
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Solution

Principal (P) = ₹ 870

Amount (A) = ₹ 1044

∴ S.I. = A − P

= ₹ 1044 − ₹ 870

= ₹ 174

Rate (R) = `2 1/2`

= `5/2 %` p.a.

= 2.5%

∴ Time = `("S.I." xx 100)/(P xx R)`

= `(174 xx 100)/(870 xx 2.5)`

= 8 years

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Chapter 10: Simple Interest - Exercise

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Selina Concise Mathematics [English] Class 7 ICSE
Chapter 10 Simple Interest
Exercise | Q 5
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