13 and 15. Please provide formulas and show all work. Thank you

If you were guaranteed $50,000 in 5 years or $75,000 in 8 years, which would you accept your opportunity cost is 15%? What if your opportunity cost is 5%? (Solving for PV) If you were guaranteed $60,000 in 6 years or $95,000 in 8 years, which would you accept your opportunity cost is 15%? What if your opportunity cost is 5%? (Solving for PV or Ordinary annuity) You are expected to receive $20,000 at the end of each of the next 30 years. If the opportunity cost of capital (interest rate) is 12% per year, compounded annually, what is its present value? (Solve for PV of Ordinary annuity) You are expected to receive $30,000 at the end of each of the next 20 years. If the opportunity cost of capital (interest rate) is 13% per year, compounded annually, what is its present value? (Solve for FV of Ordinary annuity) You are expected to receive $10,000 at the end of each of the next 20 years. If the opportunity cost of capital (interest rate) is 10% per year, compounded annually, what is its future value? (Solving for FV of Ordinary annuity) You are expected to receive $50,000 at the end of each of the next 10 years. If the opportunity cost of capital (interest rate) is 10% per year, compounded annually, what is its future value? (Solving for PMT of Ordinary annuity) You want to have $50,000 by saving at the end of each of the next 10 years. If the opportunity cost of capital (interest rate) is 10% per year, compounded annually, how much must you save annually? (Solve for PMT of Ordinary annuity) You want to have $1,000,000 by saving at the end of each of the next 10 years. If the opportunity cost of capital (interest rate) is 12% per year, compounded annually, how much must you save annually