A Sum of Rs 8000 inverted at compouniinterest doubles in five years Af

1.	A Sum of Rs 8000 inverted at compouniinterest doubles in five years Aftertwenty years becomes
Answer» Given, P = 8000, A = 16000, T = 5 yearsLet Rate of Interest = R Then,For compound interestA = P(1 + R/100)^516000/8000 = (1 + R/100)^5(1 + R/100)^5 = 2.......(1) Let for T = 20 years, Amount = A1 A1 = P(1 + R/100)^20A1 = 8000[(1 + R/100)^5]^4A1 = 8000(2)^4A1 = 8000*16A1 = 128000 Therefore, After 20 years amount will become Rs 128000

A Sum of Rs 8000 inverted at compouniinterest doubles in five years Aftertwenty years becomes

Answer»

Given, P = 8000, A = 16000, T = 5 yearsLet Rate of Interest = R

Then,For compound interestA = P(1 + R/100)^516000/8000 = (1 + R/100)^5(1 + R/100)^5 = 2.......(1)

Let for T = 20 years, Amount = A1

A1 = P(1 + R/100)^20A1 = 8000[(1 + R/100)^5]^4A1 = 8000(2)^4A1 = 8000*16A1 = 128000

Therefore, After 20 years amount will become Rs 128000