Business Functions
-- revenue function is R(x) = (price per units sold)x
-- cost function is C(x) = fixed cost + cost per unit produced(x)
-- profit function is P(x) = R(x) - C(x)
-- the intersection of R and C is the break-even point
-- the x-coordinate of the break-even point shows how many units must be produced and sold to break-even
-- the y-coordinate shows the income and outcome of money
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