



 
Hi, I can help you get started. Suppose Mr A paid $\$a$ for the car and Mr B paid $\$b$ for the car. Since the profit margin was 20%, the profit that Mr A received was 20% of $\$b.$ Hence $\$a$ is 80% of $\$b$ or $a = 0.8 b.$ Can you complete it now? Penny 



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