Suppose that both Wiremu and Aroha both have an income of $$5000$ a month. Each buys $100$ litres of petrol a month for their cars, and each buys a pizza on Friday nights.

Then Wiremu has his hours at work reduced so he earns $$4800.$ Aroha gets a pay raise and earns $$5200.$ Both end up buying $120$ litres of petrol a month. From this information we can tell that:

Question $4$Select one:

a$.$

petrol is an inferior good for both Wiremu and Aroha.

b$.$

petrol is an inferior good for Wiremu and a normal good for Aroha.

c$.$

petrol is a normal good for Wiremu and an inferior good for Aroha.

d$.$

petrol is a normal good for both Wiremu and Aroha.