A driver wishes to buy petrol and have her car washed. Petrol costs $1 a litre. The car wash normally costs $3. However, if she buys 20 litres of petrol the car wash is free. The true cost of the twentieth litre of petrol is: O a. -$2 O b. None of the others $0 O d. $1 O e. $2
A driver wishes to buy petrol and have her car washed. Petrol costs $1 a litre. The car wash normally costs $3. However, if she buys 20 litres of petrol the car wash is free. The true cost of the twentieth litre of petrol is: O a. -$2 O b. None of the others $0 O d. $1 O e. $2
Chapter1: Making Economics Decisions
Section: Chapter Questions
Problem 1QTC
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