Question

A sum of money becomes 9 times in 20 years. Find the rate of interest.​

Answer 1

Answer:

Apply this relation twice :

(n - 1) x 100 = rt

First : (2 - 1) x 100 = 20r

=> r = 5%

Second : (4 - 1) x 100 = 5t

=> t = 300/5 = 60 years

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Rate =( x×202x×100 )%p.a.=10%p.a.