help me in this assignment plz

QI: A- Assume someone decides to invest $100,000 per year for the next four years in an annuity they expect to compound at 10% per year. The expected future value of this payment stream is: B- Assume someone decides to invest $100,000 per year for the next four years in an annuity due they expect to compound at 10% per year. Its future value would be: C- Assume a person has the opportunity to receive an ordinary annuity that pays $50,000 per year for the next 10 years, with a 8% discount rate, or take a $250,000 lump-sum payment. Which is the better option? D- Osama borrows $1000 from Basil for three years at an annual interest rate 10%. After one year Osama makes a partial payment of $500 dollars. After two years Osama makes a partial payment of $100 dollars. How much does Osama have to pay at the due date? Use the Merchant's rule then US rule