Rs. 6400 were lent to Feroz and Rashmi at 15% per annum for `3""1/2` and 5 years respectively. The difference in the interest paid by them is Rs. 150.

A sum is split into two equal parts. One of part is lent at simple interest at 20% per annum for 6 years. The other part is lent at 40% per annum simple interest for 2 years. The difference in the interest is Rs 71. Find the total sum in Rs.

Find the compound interest on Rs 24000 at 15% per annum for 2 1/3 years.

Rs. 6000 was lent at compound interest for 2 years. The rates of interest for the first and second years were 10% per annum and 30% per annum respectively. If the rate of interest each year had been 20% per annum, then the additional amount obtained would have been (in Rs. ).