You can buy 150 droppies (a droppie is the unit of currency in your home country) for a dollar at official banks. Your relative, who dabbles in the black market, will sell you droppies for $0.00725 each.

a. How many droppies can you buy at the official bank with $1000?

b. How many droppies could you buy from your relative on the black market with $1000?

c. How much would you gain or lose by exhanging $1000 on the black market instead of going to the bank?