Use simple interest and compound interest separately for each question）

7. Determine the increased amount of capital, if its original amount is 1000 UAH, the complex interest rate is 5%, the accrual period is 3 years. Compare the result with the amount of increased amount, calculated using a rate of simple interest.

8. What amount should be invested in a bank at 7% per annum at a difficult interest rate for 3 years, to receive $ 2000 by the end of the specified period. USA?

9. What rate of complex interest was used in the calculations if the initial amount of capital is $ 3500. USA, increased amount of $ 5898. USA? Capital was invested for 5 years.

10. Determine the amount of contribution if capital in the amount of $ 2800. The US is invested for 3 years under 9% at a difficult rate. Interest is charged: a) 1 time per year b) monthly

11. Determine the increased amount of contribution if capital in the amount of $ 6800. The US is invested for 2 years at 7.5% at a difficult rate. Interest is charged: a) every six months b) quarterly

12. Contribution in the amount of 12000 UAH. Accepted at 16.3% for simple. What amount will the depositor receive in 9 months?