Question 1 a) and b) please

Question 1 (20 Marks) L Ping makes a single product and has the following data for the past three operating periods: Period 1 Period 2 Period 3 1000 E000 000 Sales revenues 342 386 422 Total operating costs 289 315.5 338 Operating profit 54 70.5 The total fixed costs, unit variable costs and the selling price per unit have all remained constant in the past three periods Required Use the high-low method to determine the periodic faed costs 84 by Calculate for Period 4 the total sales revenue required in order to eam a net profit of 495,000 Ich fine direct and indirect costs