The simple interest of a principal increases by `Rs42.50` when the rate of simple interest per annum increases from `7%` to `7(1)/(2)%`. Find the principal.

If the principal is double in ten years, then the rate of simple interest per annum is

If the interest of a principal in 2 years be (1)/(8) of it, then find the rate of simple interest per annum.

If the simple interset of Rs750 in 3 months be Rs22.50 , then the rate of interest in percent per annum is

The simple interest of a principal in 1 year and 9 months at the rate of simple interest of 5% per annum is 63Rs more than of the same principal in 2 years and 4 months at the rate of simple interest of 4(1)/(2)% per annum. Find the principal.

The total interest of a principal of Rs2000 in 18 months at the rate of yearly simple interest 6% is

Total interest of Rs 400 for 2 1/2 years at the rate of 6% simple interest per annum is

If a principal becomes dublein 10 years. Then the rate of simple interest in prescent per annum will be

The total interest of a principal in n years at the rate of simple interest of r% per. Annum is pnr/25, then the principal will be

What will be the simple interest of a principal of Rs3500 at a rate of 6% simple interest per annum from 5th January to 31 st May, 2012 ?

The amount of ₹ a in 20 years at the rate of simple interest of a % per annum is ………………