$27.$ What is the holding period yield for an investor who pays $$1,250$ for a three$-$year bond with a $$1,000$ face value and a $6\%$ coupon and sells the bond two years later for $$1,320?$

a$.7\mathrm{.}50\%$

b$.15\mathrm{.}26\%$

c$.6\mathrm{.}87\%$

d$.12\mathrm{.}01\%$