Question

Find the rate of interest if a sum of money gets doubled in 8 years?

Answer 1

bonjour dear

Let the sum of money that's principal be x.  

Time = 8years  

Amount after 8 years becomes double = 2x  

Therefor, Simple Interest = Amount - Principal = 2x-x = x  

Rate per annum = SI×100/ P×T = x×100/x×8= 100/8 = 50/4 = 12.5

hope it helps

#be brainly

Answer 2

Answer:

12 1/2

Step-by-step explanation:

Let Principal=x

Time= 8

Amount= 2x

Interest= 2x-x=x

Rate=100×Interest/Principal×Time

= 100×x/x×8

= 100/8

= 25/2

= 12 1/2

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