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

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

Problem 1QTC

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Question

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
O c. $0
O d. $1
O e. $2

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