Answer:
a. 1.33
b. $337,000,000
Explanation:
Degree of operating leverage = Contribution ÷ Earnings Before Interest and Tax
                         = 2,000,000 × ($200 - $140) ÷ ($120,000,000 - $30,000,000)
                         = 1.33
Recession : After tax Cost of Profit
Sales (2,000,000 × $200)               $400,000,000
Less Variable Costs (2,000,000 × $140)   ($280,000,000)
Contribution                          $120,000,000
Fixed Cost                            ($30,000,000)
Profit Before Tax                       $90,000,000
Taxation                              ($27,000,000)
Profit After tax                         $63,000,000
After tax Cost of Profit = Sales - Profit After tax \
                    = $400,000,000 - $63,000,000
                    = $337,000,000