Joe is a used car seller. Usually, he bought the old car with a good car, and then sold together and earned 30% profit.
Sometise, a customer does not have any suspicion to buy a second-hand car from the hand of the hand, but after three months, the car is broken. Customers who are very dissatisfied find to refund. Qiao refused, but agreed to recover the car with 80% of the transaction price at the time. The customer finally agreed.
Do you know how many percentage profits of Joe earned in the entire transaction?
