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To find the rate of change in the cost of gas per gallon, we can use the formula for slope:
slope = (change in y) / (change in x)
In this case, the change in y represents the change in cost of gas, and the change in x represents the change in number of gallons pumped.
Using the given points (4,15) and (8,30), we can calculate the slope as:
slope = (30 - 15) / (8 - 4)
= 15 / 4
Therefore, the rate of change in the cost of gas as each gallon is pumped is $15/4 per gallon.