Final answer:
The marginal utility of the last cowboy hat purchased by Todd is 400. This is determined by ensuring the marginal utility per dollar is equal for both jeans and cowboy hats, with jeans providing a marginal utility of 200 and costing $50 each.
Step-by-step explanation:
To determine Todd's marginal utility from the last cowboy hat purchased, we need to apply the concept of marginal utility per dollar. The marginal utility per dollar is the amount of additional utility received from spending one more dollar on a good. It is calculated by dividing the marginal utility of an item by its price. Todd's optimal choice would be where the marginal utility per dollar is equal for both jeans and cowboy hats.
Since each pair of jeans costs $50 and provided a marginal utility of 200, we can calculate the marginal utility per dollar as follows:
- Marginal utility per dollar for jeans = Marginal utility of jeans / Price of jeans = 200 / $50 = 4
Given this, we can set up the equation for cowboy hats to find their marginal utility, knowing that the cost of a cowboy hat is $100:
- Marginal utility per dollar for hats = Marginal utility of hats / Price of cowboy hats
- 4 = Marginal utility of hats / $100
- Marginal utility of hats = 4 * $100
- Marginal utility of hats = $400
Therefore, Todd's marginal utility from the last cowboy hat purchased is 400.