b. Calculus Company makes professional calculators. The profit plan and actual results for the previous year, 2020, are as follows: Profit Plan Actual Results Volume Pounds Volume Pounds Sales 3,000 42,000 6,000 60,000 Cost of Goods Sold Raw material (KG) 5,000 8,000 8,000 12,000 Raw material (L) 10,000 7,500 12,000 6,000 Labor (Hours) 900 4,500 1,600 12,000 Contribution Margin 22,000 30,000 Other costs Energy 3,000 5,000 Maintenance 2,000 3,000 Depreciation 4,000 5,000 Selling expenses 6,000 6,000 Advertising 6,000 7,000 Profit before interest and tax 1,000 4,000 The plant manager, Salem, has instructed the plant management accountant to prepare a detailed repor to be sent to corporate headquarters comparing each component's actual result with the amounts set forth above in the annual budget. Required: Explain the difference between the expected and actual profit. Show your workings