Really need help practising for Exams

The following information is available for a company: Year 1 Year 2 Year 3 Year 4 Sales/production (units) 67,200 71,300 75,600 75,100 Total costs (E 135,000 144,065 156,090 158,429 Cost inflation index 100 103.5 107.5 110.0 Required: 1. Determine a linear function for total costs per annum (at Year 1 prices) from the above data, using the high-low method. (Do not round variable cost element in the intermediate calculations. Round the first coefficient to 3 decimal places and the second coefficient the to nearest whole number.) 2. Using the function from requirement 1 and the data above, evaluate the accuracy of the function as a predictor of costs. (Round your answers to 2 decimal places. Enter your answers as a positive values. Do not round variable cost element in intermediate calculations. Round your other intermediate calculations to nearest whole pound.) Is the cost equation (adjusted for inflation) an accurate predictor of costs under existing operating conditions? O Yes O No 3. Using the function from requirement 1, forecast the total costs in Year 5 based on a volume of 77,200 units and a cost inflation index for Year 5 is 112.9. (Do not round variable cost element in intermediate calculations. Round your answer to the nearest whole pound.) 4. Selling prices in Year 5 are expected to be 15% higher than those in Year 1, when total sales revenue was f159,936. Draw a profit-volume chart for Year 5, showing sales up to 90,000 units per annum. (Do not round your intermediate calculations. Round your answers to the nearest whole pound.)