$15)$ Tom Corp.$\text{'}$s bonds currently sell for $$1,005$ with a $7\mathrm{.}5\%$ coupon paid semiannually and a $15-$year maturity.

$16$ However, the bonds can be called in $6$ years at $$1,035.$ Assume that no costs other than the call premium would be incurred to call and

refund the bonds, and also assume that the yield curve is horizontal, with rates expected to remain at current levels

levels on into the future. Under these conditions, what rate of return $($annual$)$ should an investor expect to earn if he or she purchases these bonds?