Question

At what rate of interest per annum compounded annually will a sum of money become 81 times in 4 years

Answer 1

Answer:

200%

Step-by-step explanation:

p(1+r/100)^4= 81p

(1+r/100)^4=3^4

r=2×100

200%

Answer 2

Given :- At what rate of interest per annum compounded annually will a sum of money become 81 times in 4 years .

Formula used :-

when rate is compounded annually,

• Rate = [(Times)^(1/T) - 1] * 100
• Times = number of times sum becomes .
• T = Total time .

Answer :-

putting given values we get,

→ R = [(Times)^(1/T) - 1] * 100

→ R = [(81)^(1/4) - 1] * 100

→ R = [(3⁴)^(1/4) - 1] * 100

→ R = [3^(4 * 1/4) - 1] * 100

→ R = [3 - 1] * 100

→ R = 2 * 100

→ R = 200% (Ans.)

Learn more :-

CI in 2yr is Rs. 1600 and in 3 yrs it will be Rs. 1700. Find the rate of interest.

https://brainly.in/question/32463301

7. Abhishek invested some amount for 3 yrs at rate of 16(2/3)% per annum at Cl. The difference of CI obtained

only on 3r...

https://brainly.in/question/38286271