Question

A sum of money in 4 years becomes Rs. 2016 and in 9 years becomes Rs. 2286. What is the principal
sum where the simple rate of interest is to be charged?​

Answer 1

Step-by-step explanation:

S.I. of 1 year = Amount after 9 year – Amount after 4 year = 2286 - 2016 = 270

P = Amount of 9 years – S.I of 9 years = 2286 – 270 × 3 = 2286 – 486 = 1800

S.I = (P × R × T)/100

⇒ 162 = (1800 × R × 1)/100

∴ R = 162/18 = 9%

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