Bob purchased gasoline from four different gas stations last month. The following table shows the price per gallon and the gallons of gasoline that he purchased.
Gas Station
Gallons Purchased
Price per Gallon ($)
Texaco
10
3.80
Mobil
8
3.10
BP
18
4.80
Shell
12
3.99

Determine the average price per gallon that Bob paid for the gasoline.