On a certain day, a bakery produced a batch of rolls at a total production cost of $300. on that day, of the rolls in the batch were sold, each at a price that was 50 percent greater than the average (arithmetic mean) production cost per roll. the remaining rolls in the batch were sold the next day, each at a price that was 20 percent less than the price of the day before. what was the bakery's profit on this batch of rolls?
a. $ 150
b. $ 144
c. $ 132
d. $ 108
e. $ 90