Nelson Manufacturing has the following data: Variable costs are 60% of the unit selling price. The contribution margin ratio is 40%. The unit contribution margin is $500. The fixed costs are $500,000. Which of the following does not express the break-even point?

a. $500,000 $500 = X

b. $500,000 .40 = X

c. $500,000 + .40X = X

d. $500,000 + .60X = X