Question

A sum of money becomes 4 times in 20 years at simple interest find the rate of interest​

Answer 1

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Let, The principle = ₹ X

Therefore,

Amount = ₹4x

Time = 20 yrs.

Now, Interest = ₹ Amount - Principle

= ₹ 4x - x

= ₹ 3x

Now, We know that,

Interest = P × R × T/ 100

=> 3x = x × R × 20/ 100

=> 3x = x × R × 2/ 100

=> 30x = 2 × R × x ( by cross multiplication)

=> 30x/x = 2×R

=> R = 30/ 2

=> R = 15

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Answer 2

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Step-by-step explanation:

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