15. We continue to consider Jim's consumption of X and Y. Suppose the price of X increases to $2 per unit, the price of Y remains unchanged. Jim will adjust his consumption accordingly of course. From the graph to the right we know that the total change in consumption of X due to the change in price is:
We know that after the price increase Jim is on the purple budget buying 32 units of X. Prior to the price change he was buying 50 units so the total change in consumption due to the price change is 50 - 32 = 18.
