Shag Express,a Retailer of Lamps,has Determined That Its Total Cost

Multiple Choice

Shag Express,a retailer of lamps,has determined that its total cost of retailing lamps is TC = 200 + 10Q + 5Q².At 10 units of output,the firm's marginal cost is:

A) $110.
B) $100.
C) $800.
D) $230.
E) $10.