QRS Limited is domiciled in a country where firms must pay 15% tax on their first 150,000 of earnings. Any earnings above that are charged at a rate of 23%. In 2020 QRS Limited has a taxable income of 710,000. What is the average tax rate (rounded to 2 decimal places) paid by the firm? a) 21.31% b) 21.29% c) None of the other answers is correct d) 21.26% e) 19%