without excl, calculation by writing

4. Assume that the annual income of Mr. John is OMR 1,200,000. Based on the following tax principles calculate the average tax rate and draw two diagrams to show average and marginal tax curves Tax base Progressive tax rate Below 200,000 0% 200,000 -- 400,000 10% 400,000 -- 700,000 20% 700,000--1,000,000 25% 1,000,000 and above 30%