Please explain this step by step I am trying to understand this topic <3 thank you!

The loan amount is 10,000 USD, the annual interest rate is 4% and the loan is repaid twice a year on an annuity basis over 5 years. (a) What is the amount of the installment? (b) How much interest will be paid in total over the lifespan of the loan? (c) How much interest would be paid in total if, instead of the annuity, the repayment of the loan principal were the same in each half of the year?