Clear and full working out please for all parts

Given below are the data for Hobul Pty Ltd relating to its sales and wages for the years 2017 to 2020 Sales Wages 2017 $ 732,100 $ 143,333 2018 $ 942,500 $ 157,770 2019 $ 1,187,900 $ 162,800 2020 $ 1,232,100 $ 168,333 Sales is considered to be a potential cost driver, and wages cost has mixed costs. Required Using the high-low method, create a cost function for wages costs. a) b) In your own words, explain why the high-low method might not be a good method for estimating the cost function. c) Perform regression analysis to create a cost function for wages costs. d) Can we know for certain that the cost function from part (c) provides a good estimate for next year's wages costs? Why? e) Discuss whether sales are an economically plausible driver for wages costs for Hobul Pty Ltd