An investment proposal will have annual fixed costs of $60,000, variable costs of $35 per unit of output, and re $55 per unit of output. What volume of output will be necessary for an annual profit of $60,000? Determine the break-even quantity. Calculate the profit at break-even quantity. In one sentence, describe the general difference between total revenue and variable cost graphs. Consider the following LP model: Maximize 9x_1 + 9x_2 + 6x_3 subject to constraint a: 5x_1 + 6x_2 + 3x_3 lessthanorequalto 600 lbs constraint b: 2x_1 + 4x_2 + 5x_3 lessthanorequalto 600 minutes