Suppose the U$.$S$.$ Treasury offers to sell you a bond for $$637\mathrm{.}25.$ No payments will be made until the bond matures $4$ years from now, at which time it will be redeemed for $$1,000.$ What interest rate would you earn if you bought this bond at the offer price?

a$.16\mathrm{.}21\%$

b$.11\mathrm{.}92\%$

c$.39\mathrm{.}23\%$

d$.6\mathrm{.}98\%$

e$.9\mathrm{.}43\%$