Mary bought a used car for $3,500 which was financed for $160 a month for 24 months
a) what is the total cost of the car
b) how much is the finance charge

A) to know the total cost of the car we simply multiply the cost per month with the number of months to pay, in equation $160/ month x 24 months, cancelling out the unit of months, the answer is $3,840.
b) To know the cost of finance charge we simply subtract the total cost of the car using credit with its cost, in equation $3,840 - $3,500 = $340.
The finance charge is $340.