At what nominal annual rate of interest will a $$196,000$

variable$-$rate mortgage be amortized by monthly payments of

$$1,666\mathrm{.}87$ over $20$ years? Assume interest is compounded

semi$-$annually.Select one:a$.8\mathrm{.}54\%$b$.8\mathrm{.}37\%$c$.5\mathrm{.}54\%$d$.7\mathrm{.}54\%$e$.6\mathrm{.}54\%$