Since Margo purchase her optimal consumption bundle, the marginal utility per dollar consumed on dance lessons must be equivalent to the marginal utility per dollar paid on dance shoes. The marginal utility per dollar spent on dance lessons is 100 utils per lesson, where $50 per lesson is equivalent to 2 utils per dollar. The marginal utility per dollar expended on dance shoes therefore has to equal 2 utils per dollar. Since the marginal utility of a pair of dance shoes cost 300 utils per pair, the value of a pair of shoes should be $150 per pair, so that 300 utils per pair/$150 per pair is equal to: 2 utils per dollar.
