Which of the following equations are correct?
a) Contribution margin 3 - part-variable costs = net profit
b) Net turnover - contribution margin 1 = contribution margin 2
c) Contribution margin 2 + part-variable costs + variable manufacturing costs = net turnover
d) Net profit = contribution margin 3 + corporate fixed costs
Answer: c) Contribution margin 2 + part-variable costs + variable manufacturing costs = net turnover