pls answer the questions below at screenshots, thanks a lot

l. Bootstrap and Lock in Forward Rate: (a) Imagine that currently in the market the following bonds are available: Maturigg Coup on Rate Price 0.5 0% $ 97.500 1.5 8% $101500 1.5 0% $ 90.100 2.0 0% $ 85.200 Maturity is in years, coupons are paid semiannually but quoted annually on a bond equivalent basis, and prices are quoted per $100 face value. Construct a 2-year spot yield curve from this information. More precisely, calculate a spot rate for each six-month period. Report the rate on a bond equivalent basis. (b) Assume the zero-coupon bonds from 1 year to 4 years are all available, and the current l-year, 2- year, 3-year and 4-year spot rates are 4%, 5%, 6% and 7% accordingly. Interest rates are annually compounded. You want to lock in a l-year interest rate beginningin 3 years, by using some of the zero- coupon bonds above. Which zero-coupon bonds would you use? And what is the locked-in l-year rate beginning in 3 years