(a) Oskar has $100 and he buys apples at $6 per kg and kiwi at $7 per kg. When he buys more than 4kg of apples, he qualifies for the discount: each kg of apples above 4kg costs only $3 per kg.

He draws his budget line with apples on the horizontal axis and kiwis on the vertical axis.

If he buys more than 4kg of apples, the equation of his budget line is given by:

(b)

Felicia has $100 and she buys pears at $3 per kg and oranges at $5 per kg. When she buys more than 5 kg of pears, she has to pay premium: each kg of pears above 5kg costs $5 per kg.

She draws her budget line with pears on the horizontal axis and kiwis on the vertical axis.

If she buys more than 5 kg of pears, the equation of her budget line is given by: