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Supply and Demand: More, Always More

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In the cowbell manufacturing industry, which is competitive, there are 100 independent factories. Each of them has the marginal cost curve:

$$MC = 10 + 2Q$$

If the price of cowbells increases from 20 to 40, how much will the quantity supplied of cowbells increase?

A

1500

B

1000

C

500

D

10