Final answer:
Sam can increase his utility by consuming fewer apple juices and more bagels because the marginal utility per dollar is higher for bagels, indicating that he has not yet maximized his utility based on his current consumption choices.
Step-by-step explanation:
When considering whether Sam can increase his utility from consuming apple juice and bagels, it's important to look at the marginal utility per dollar spent on each good. The marginal utility per dollar for apple juice is 10 (since it costs $1 per glass), and for bagels, it is 12.5 (since they cost $2 each). For Sam to maximize his utility, he should consume goods until the marginal utility per dollar spent is equalized across all goods. Since the marginal utility per dollar is higher for bagels (12.5) than for apple juice (10), Sam can increase his utility by consuming fewer apple juice and more bagels. Adjusting consumption in this way will continue until the marginal utility per dollar is the same for both goods, at which point Sam would have reached his utility-maximizing choice given his budget constraint.