Find the compound interest at the rate of 5% for three years on that principal which in three years at the rate of 5% per annum given Rs 12000 as simple interest.

Find the compound interest at the rate of 5% per annum for 3 years on that principal which in 3 years at the rate of 5% per annum given Rs 1200 as simple interest.

Find the compound interest at the rate of 5% per annum for 3 years on that principal which in 3 years at the rate of 5% per annum given Rs 1200 as simple interest.

Find the compound interest at the rate of 10% per annum for two years on that principal which in two years at the rate of 10% per annum given Rs 200 as simple interest.

Find the compound interest at the rate of 10% per annum for two years on that principal which in two years at the rate of 10% per annum given Rs 200 as simple interest.

Find the compound interest at the rate of 10% per annum for four years on the principal which in four years at the rate of 4% per annum given Rs 1600 as simple interest.

Find the compound interest at the rate of 10% per annum for four years on the principal which in four years at the rate of 4% per annum given Rs 1600 as simple interest.

Simple interest on a principal of Rs. 100 for 2 years at the rate of 5% per annum is ____.