. The price, p, in dollars of a product is given by p(n) = = 36 - 0.4n, 0≤n≤90, where n is the number of units sold each day. The operating cost of the business is $100 per day, plus $20 in commission for each item sold. a) Find the daily revenue function. b) Find the daily cost function. c) If the profit function is given by P(n) = R(n) - C(n), for what values of n will the profit be greater than or equal to zero?

The percent of high school students who smoked cigarettes on 1 or more of the 30 days preceding the survey is given by y = -0.064x² +0.277x +33.715, where x is the number of years after 1990. During what years from 1990 on is the percent greater than 30%? From to the percent is greater than 30%. (Round up to the nearest year as needed.)

A builder needs to rent a dump truck for a day for $75 plus $0.80 per mile. Find the cost function. (Let x be the number of miles.)C(x) =

A firm sells a product for $80 per unit. Raw material costs are$12,50 per unit, labor costs are $27,50 per unit, and annual fixedcosts are $260,000.a. Determine the profit function P(x), where x equals the numberof units sold.b. How many units would have to be sold to earn an annualprofit of $250,000.