please answer with explanations

Frankel Ltd., a British merchandising company, is the exclusive distributor of a product that is gaining rapid market acceptance. The company's revenues and expenses (in British pounds: 9) for the last three months are given below: Frankel Ltd. Comparative Income Statements For the Three Months Ended June 30 April May 4,200 5,300 June 6,400 Sales in units Sales revenue Cost of goods sold 940,800 1,187,200 1,433,600 546,000 689,000 832,000 Gross margin 394,800 498,260 601,600 Selling and administrative expenses: Shipping expense Advertising expense Salaries and commissions Insurance expense Depreciation expense 111,000 90,000 153,000 10.700 56,000 133,000 90.000 181,600 10700 56,000 155,000 90,000 210,200 10,700 56,000 Total selling and administrative expenses 420,700 471,300 521,900 Operating income (loss) (25.900) 26,900 79,700 2. Using the high-low method, separate each mixed expense into variable and fixed elements. State the cost formula for each mixed expense. (Omit the "" sign in your response.) Y= $ + X Shipping expense Salaries and commissions expense Y= + $ X. 3. Redo the company's income statement at the 6,400-unit level of activity using the contribution format. (Input all amounts as positive values. Omit the "c" sign in your response.) Frankel Ltd. Income Statement For the Month Ended June 30 $ (Click to select) Variable expenses: (Click to select) (Click to select) (Click to select) $