On a certain day, a bakery produced a batch of rolls at a total production cost of $300. On that day, ~$\frac{4}{5}$~ 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?
$150
$144
$132
$108
$90
生产x个,300/x*4/5*x*1.5+300/x*1/5*x*1.5*(1-20%)-300=132
登录 或 注册 后可以参加讨论