Calculate the price of the following bonds, where F is the face value, c is the coupon rate, N is the number of years to maturity, and i is the interest rate (or discount rate, or yield). Please show step by step work/equation, not excel forumula:

1a. F = $100, c = 10%, N = 2, i = 8% 1b. F = $10,000, c = 6%, N = 3, i = 9% 1c. F = $1,000, c = 0%, N = 10, i = 6% d. F = $10,000, c = 7%, N (bond never matures), i = 6%