A certain sum amounts to Rs. 4800 in 4 years and to Rs. 5250 in 5 years at simple interst. Find the interest for 2 years.

A certain sum amounts to Rs 73,255 in 3 years, and Rs 84,525 in 5 years at simple interest. Find the sum.

A certain sum becomes Rs. 6400 in 4 years and Rs. 8200 in 7 years at simple interest. Find the pricipal.

A certain sum of money amounts to Rs 4200 in 3 years and to Rs 6000 in 6 years at simple interest. Find the rate of interest.

A certain sum amounts to Rs. 4500 in 2(1)/(2) years at 20% per annum simple interest. Find the sum (in Rs. ).

A sum of money amounts to Rs. 4500 in 2 years and Rs. 6750 in 4 years Compound Interest. Find the sum.