Core Principles of Economics $$ End of Chapter Problem

se the cost$-$benefit principle to evaluate the following:

$.$ You are about to buy a calculator for $$10,$ and the sales$-$person tells you that the model you want to buy is on sale for $$5$ at the tore's other branch, which is a $20$ minute drive away.

You should make the trip to the other branch if:

b$.$ You are about to buy a laptop for $$1,000$ and the sales$-$person tells you that the model you want to buy is on sale for $$995$ at the store's other branch, which is a $20$ minute drive away.

You should make the trip to the other branch if:

c$.$ Your choice in parts a and $b$ should be in both scenarios. But some people may ignore costs and focus