Answer: The the minimum price that would induce this company to produce the 601st heart rate monitor is $70.
Explanation: The marginal cost of producing one more unit is equal to 30070 - 30000 = 70.
A company produces to the point where the price is equal to the marginal cost. In other words, the cost of producing one more unit does not exceed the benefit to be obtained from the sale of one more unit.