Ian gets 20 utils of satisfaction from eating a pear that costs $0.40. calculate the corresponding marginal utility per dollar spent.

Marginal utility refers to the amount of satisfaction a person gains from consuming one more unit of a good or service. We can calculate the marginal utility by dividing the amount of satisfaction over the total dollar spent.

Marginal Utility = 20 utils / $0.40

Marginal Utility = 50 utils per dollar spent

you have to put the parentheses like this:

in fact, you have to perform the operation inside parentheses first, and then proceed in order: