If there are 200 identical firms in this market, what level of output will be supplied to the market when price is $2.00?

In order to do that, you just have to need to multiply it with the quantity that align with the marginal cost with the total firms.

Assume that the quantity with the price of $ 2.00 is 200 Units, the level of output would be :
200 x 200 = 40,000 Units

General education? that is the only one i could think of.