Question

. A sum of money lent out at C.I. at a certai
rate per annum becomes three times of itse
in 10 years. Find in how many years will the money becomes 20 times. pa​

Answer 1

Step-by-step explanation:

On interest being compounded for 8 years, Amount=P(1+100R)N

=>3P=P(1+100R)8 

=>3=(1+100R)8 --- (1)

On interest being compounded for n years, Amount=P(1+100R)N

=>27P=P(1+100R)n 

=>27=(1+100R)n 

=>33=(1+100R)n --- (2)

Putting the value of 3 from eqn 1 in eqn 2, we  get 

=>((1+100R)8)3=(1+100R)n 

(1+100