Bart is purchasing a stock of watches from Big Tony's resale shop he can buy 30 watches for $500 or 50 watches for $800 and then both cases the variable cost per unit is $0.07 part estimates he can sell the 30 watches for a price of $45.99 but would have to drop the selling price to $42.99 to self 50 watches to make the greatest profits should Bart purchase 30 watches or 50 watches?