A certain sum of money amounts to Rs 1008 in 2 years and to Rs 1164 in `3 1/2` years. Find the sum and the rate of interest.

A certain sum of money amounts to Rs 1008 in 2 years and to Rs1164 in 3(1)/(2) years.Find the sum and the rate of interest.

A certain sum of money amounts to 756 in 2 years and to 873 in 3.5 years. Find the sum and the rate of interest.

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 of money at compound interset amounts to Rs 6,600 in 1 year and to Rs 7,986 in 3 years. Find the sum and the rate percent.

A certain sum of money amounts to Rs. 918 in 2 years and Rs. 969 in 3.5 years at simple interest. What is the rate of interest (in % per annum)?