Question

The rate of interest on a certain sum for first 2 years in
5% for next 3 year 8% and for next 5 years and for the
next period is 10%. If total interest into the sum in 8
years is Rs.1280. What was that sum?​

Answer 1

Answer:

₹2000

Step-by-step explanation:

r1 = 5%,

r2 = 8%,

r3 = 10%,

t1 = 2 years

t2 = 3 years,

t3 = 8 - (2 + 3) = 3 years

Principal = (Interest x 100) / [(r1 x t1) + (r2 x t2) + (r3 x t3 )]

= (1280 x 100) / (5 x 2 + 8 x 3 + 10 x 3)

= 128000/(10 + 24 + 30)

= 128000/64

=Rs. 2000

Hope this helped