Answer:
Do not offer cat grooming
Step-by-step explanation:
Marginal cost = $30
Marginal Revenue = $25
According to the given situation Since marginal revenue is less than the marginal cost which decreases the profit. Here, we do not know about the rent as it is a fixed cost also we will not change if he wants to add further services.
Therefore, we will only consider the marginal benefits and cost of introducing the services. So Roger should not offer cat grooming.