Answer:
d) The inventor should produce all the units for which marginal revenue equals or exceeds marginal cost.
Step-by-step explanation:
The inventor has a new and innovative product that can change the color of a person's eyes with no negative side effects.
She now has a monopoly in the market. To maximise her profits she needs to set price of the product so marginal revenue is equal to or greater than the marginal cost.
Marginal revenue is the additional income earned per unit produced, while marginal cost is the additional cost incurred with extra unit produced.
When MR is equal to MC the business breaks even, and when MR is greater than MC the business is making profit.