Question 9
A greengrocer is having an apple sale. The price is 6 dollars per kilogram. If the total purchase exceeds 3 kilograms, a $20\%$ discount is applied to the portion over 3 kilograms. There is no discount if the total purchase does not exceed 3 kilograms. If Leith buys 8 kilograms of apples from this greengrocer, how much does he pay?