Question

One-third of a certain sum is invested at 3% per annum; one-sixth of the sum is invested at 6% per annum and remaining sum at 8% per annum. If the annual simple interest from all these investments is rs. 600, the original sum is

Answer 1

let the original sum be x

(x/3×3/100)+(x/6×6/100)+(x/2×8/100)=600

x/100+x/100+4x/100=600

6x/100=600

hence,x=10000