Math CentralQuandaries & Queries

Question from Oyewumi:

Mr A sold a car to Mr B at 20% profit margin and Mr B sold the car to Mr C at 30% markup on cost. If Mr C got the car at $\$x. $
1. How much did Mr A buy the car in terms of x.
2. How much did Mr A buy the car if x is $\$2800000$


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?


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