Sam and Sadie charge people to park on their lawn while attending a nearby craft fair.At the current price of $10,eight people park on their lawn.If they raise the price to $15,they know that only six people will want to park on their lawn.Whether they have eight or six cars parked on their lawn does not affect their costs.From this information it follows that

Question

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If they charge $10, they earn $80 (8 cars x $10). If they charge $15, they earn $90 (6 cars x $15). Therefore, by charging $15, they would earn $10 more than by charging $10. Thus, the best choice for Sam and Sadie would be to charge $15.

Sam and Sadie Charge People to Park on Their Lawn