The following suppliers all provide an identical part in terms of$$ quality, performance, and$$ delivery, but each supplier quotes a different price and different payment window. If a$$ company's annual cost of capital is $18\%,$ which supplier should be$$ selected? Supplier A Supplier B Supplier C Unit Price $$$$80\mathrm{.}00$$$80\mathrm{.}15$$$81\mathrm{.}00$ Payment Window$($days$)3570115$ Part $2$ The effective cost of purchasing from Supplier A$($compared to Supplier$$ C$)$ is $$$ $$ per unit?