Question

in what time will rupees 5120 amount to Rupees 7290 at 12 and half percent per annum compounded annually​

Answer 1

Answer:

3 years

Step-by-step explanation:

Given:- Principal= ₹5120, Rate per annum=12.5%, Time=N , Amount=₹7290

A = P[1+1/100]N

₹7290 = ₹5120[1+12.5/100]n

7290÷5120 = [1+125/10×100]n

729÷512 = [1+1/8]n

(9/8)3 = [8+1/8]n

(9/8)3= [9/8]n

3 = n

n = time

time = 3 year

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Answer 2

Answer:

3 years

Step-by-step explanation:

Given:- Principal= ₹5120, Rate per annum=12.5%, Time=N , Amount=₹7290

A = P[1+1/100]N

₹7290 = ₹5120[1+12.5/100]n

7290÷5120 = [1+125/10×100]n

729÷512 = [1+1/8]n

(9/8)3 = [8+1/8]n

(9/8)3= [9/8]n

3 = n

n = time

time = 3 year