Paula has sales that qualify to be reported on the installment basis. In year 2, installment sales were $40,000 with a cost of $30,000. In year 3, installment sales were $50,000 with a cost of $25,000. Collections in year 2 were in the amount of $30,000. Collections in year 3 were $10,000 on the year 2 sales and $30,000 on the year 3 sales. How much deferred gross profit exists as of the end of year 2?

a.$2,500

b.$5,000

c.$7,500

d.$10,000