Question

find the rate of interest if a sum of money becomes 4 times as much in 20 years
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Answer 1

Answer:

Here is your answer buddy,

Let, The principle = ₹ X

Therefore,

Amount = ₹4X

Time = 20 yrs.

Now, Interest = ₹ Amount - Principle

= ₹ 4X - X

= ₹ 3X

Now, We know that,

Interest =  

=> 3X =  

=> 3X =  

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

=>  = 2×R

=> R =  

=> R = 15

Hope this helps you.

Be Brainly.

Step-by-step explanation: