<human>:  John rents a car to visit his family. It cost $150 to rent the car. He also had to buy 8 gallons of gas to fill it up and gas is $3.50 per gallon. The final expense is $.50 per mile. If he drove 320 miles how much did it cost?
<bot>: How much did the gas cost? ** The gas cost 8*3.5=$<<8*3.5=28>>28
How much did the mileage expenses cost? ** The mileage expenses cost 320*.5=$<<320*.5=160>>160
How much did it cost in total? ** So in total he paid 150+28+160=$<<150+28+160=338>>338
#### 338