please provide me exact answer

Suppose that household incomes in Sherbrooke changed from $96,200 to $111,800, and assuming no change in price, the quantity of a Kraft macaroni and cheese sold changed from 81 to 99 cases per week. a) What is the value of the income elasticity of demand for a Kraft macaroni and cheese? Round your answer to 3 decimal places. When applicable, remember to enter a minus (-) sign to indicate negative values. (Hint: Income plays a role here) b) What does this suggest about this product