Final answer:
The rate of change of gasoline price is $0.50 per gallon. The change of rate cannot be determined without knowing the change in quantity.
Step-by-step explanation:
The rate of change of gasoline price can be calculated by finding the difference in price per gallon over the given time period. In this case, the price changed from $2.50 per gallon on Monday to $2.00 per gallon on Saturday. The difference is $2.50 - $2.00 = $0.50.
Next, we need to find the change in gallons of gasoline. The question doesn't provide this information, so we cannot calculate the change of rate without knowing how many gallons of gasoline were purchased. The rate of change depends on both the price and quantity.
In conclusion, the rate of change of gasoline price is $0.50 per gallon. However, we cannot determine the change of rate without knowing the change in quantity.