A man invested a certain amount in scheme A at rate of 15% p.a. for two years and he received total simple interest of Rs 7800. The man increased the amount by Rs. X and invested in another scheme B on compound interest at rate of 10% p.a. for two years and received Rs. 6720 as interest. Find the value of X (in Rs.)?

If at the same rate of interest, in 2 years, the simple interest is ₹40 and compound interest, compounded annually, is ₹41, then what is the principal (in ₹)?​

The difference between the simple interest and the compound interest, compounded annually, on a certain sum of money for 2 years at 16% per annum is ₹797. Find the sum (rounded off to the nearest integer).​

If at the same rate of interest, in 2 years, the simple interest is Rs. 40 and the compound interest is Rs. 44, then what is the principal (in Rs.)?