Answer:
pat should drive if saving half an hour is worth $0.50 or more
Step-by-step explanation:
Marginal cost is the additional cost generated by producing an additional unit of output.
Marginal cost of taking the bus = 1 / 2 = 0.50
Marginal utility is the additional utility derived from consuming one more unit of a good
Marginal utility per good = marginal utility / price of the good
Pat should take the action that would yield him the highest utility given the marginal cost
So,pat should drive if saving half an hour is worth $0.50 or more