You are trying to decide between two mobile phone carriers. Carrier A requires you to pay $$$$200$ for the phone and then monthly charges of $$$$60$ for $24$ months. Carrier B wants you to pay $$$$100$ for the phone and monthly charges of $$$$70$ for $12$ months. Assume you will keep replacing the phone after your contract expires. Your cost of capital is $4\mathrm{.}0\%$APR$,$ compounded monthly. Based on cost$$ alone, which carrier should you$$ choose?