Chow Song Song Co$.,$ a Hong Kong based company borrows CAD $$10,000,000$ for one year at an annual rate of $5\%$ to expand its operations in Canada.

a$.$ What is the cost of debt in Hong Kong dollars if Canadian dollar depreciates from HKD$6\mathrm{.}13/$CAD to HKD$6\mathrm{.}00/$CAD over the year?

b$.$ What is the cost of debt in Hong Kong dollars if Canadian dollar appreciates from HKD$6\mathrm{.}13/$CAD to HKD$6\mathrm{.}50/$CAD over the year?