rs. 81.ECONOMICS: Income Tax The following func- tion expresses an income tax that is 10% for in- comes below $5000, and otherwise is $500 plus 30% of income in excess of $5000. 0.10x if 0 5000 a. Calculate the tax on an income of $3000. mof $5000 68 CHAPTER 1 FUNCTIONS c. Calculate the tax on an income of $10,000