Answer:
50 Units of milkshake
Step-by-step explanation:
The reason is that the maximum Chuck can purchase milkshakes is of $100 and spending these $100 will give access to 50 units of milkshakes. The vertical intercept for Chuck is 50 units which is the maximum number of quantity for Chuck which it can buy from his $100. So this intercept defines the feasible region for $100. Hence this intercept can be found by:
The vertical intercept for Chuck's budget line = $100 Income / $2 per milkshakes = 50 Units of milkshakes