simple interest question series

Same principal is invested in schemes of compound interest and simple interest. The interest obtained in simple interest and compound interest schemes after 2 years are Rs 1200 and Rs 1290 respectively. If the rate of interest is 15%, then what is the principal (in Rs)?

Profit Or Loss (Recap)|Simple Interest|Question Practice|OMR

A sum amounts double in 8 years by simple interest. Then the rate of simple interest p.a. is

If ratio of principal and simple interest for 1 year is 25 : 1, then the rate of interest is

Difference between compound interest and simple interest over two years

The difference between the compound interest and the simple interest on a certain sum for 2 years is equal to the interest calculated for 1 year on one year's simple interest. (True / False).

If simple interest on Rs. 400 is 256 and the rate of interest per annum equal to the number of years, then find the rate of interest.