消費者剩餘 - 經濟

題目:Assume that the market demand of good x ,produced by a monopoly
firm A, is x(p)=200-10‧p^(1/2)
(1)Derive the marginal revenue function(MR) for firm A.
(2)Firm A sells good x at 100 per unit. Calculate the consumer's
surplus.
我算出來的MR是:400-8x+3x^2/100
請問第二題的每單位100那是什麼意思? 然後消費者剩餘是用積分求出嗎?

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