Can you please help with the highlighted questions, I'm having a lot of trouble with them. Thank you so much in advance.

5. Use the formulas for elasticity to answer the following questions. a. When Mariba's income rises by 10 percent, her expenditures on carrots rise 12 percent. What is Mariba's income elasticity of demand for carrots? Are carrots, for her, a normal or an inferior good? b. Suppose that the price elasticity of demand for milk is 0.6. If a grocer raises the price of milk by 15 percent, by what percentage will milk sales decrease as a result of the price increase? Will the grocer's revenue from milk sales go up or down