1. The total cost (in dollars) of producing x electric guitars is C(x) = 1,000 + 100x - 0.25x a. Find the exact cost of producing the 51" guitar of producing the 51" guitar b. Use marginal cost to approximate the cost of producing the 51st guitar 2. The total profit (in dollars) from the sale of x calendars is P(x) = 22x - 0.2x2 - 400 where 0 S x $ 100 a. Find the exact profit from the sale of the 41* calendar b. Use marginal profit to approximate the profit from the sale of the 41" calendar