A bank offers 20% compound interest per half year. A customer deposits Rs 7600 each on 1^st January and 1^st July of a year. At the end of the year, the amount he would have gained from interest is –

The Population of vultures in a particular locality is decreases by a certain rate of interest (compounded annually). If the current population of vultures be 29160 and the ratio of decrease in population for second year and third year be 10: 9. What was the population of vultures 3 years ago? 

Two sums are in the ratio 4:3. Both the sums are lent at 5% per annum and 10% per annum under compound interest for two years. The difference between the interest at the end of two years is Rs. 1540. What was the sum lent at 10% per annum?

The simple interest on a certain sum for 2 years at a certain rate of interest is Rs.2000 and compound interest on the same sum, same time and same rate of interest is Rs.2050. Then find the ratio between CI for 2 years and CI for 3 years?

Find compound interest on Rs. 50000 at 12 % per annum for 6 months, compounded quarterly.