simple Interest = 900 for 3 years at the rate of 6 % then principal must be

If the simple interest for 6 years be equal to 30% of the principal,it will be equal to the principal after (a) 10 years (c) 22 years (d)30 years

If the simple interest for 5 years be equal to 25% of the principal, it will be equal to the principal after

A principal gets increased by 21% in 2 years at compound interest. What will be the simple interest on Rs. 1000 for 4 years at the same rate of interest ?

The interest on Rs 1,250 for 15 years at the rate of 1.6% simple interest per annum will be: