



 
Hi Sida, The dealer bought the car for £7500, added a markup sat $m$ pounds to obtain a selling price of $s$ pounds. Thus \[7500 + m = s.\] Since his cost was 7500 pounds his profit was $m$ pounds. By saying his profit was 30% you are saying the $m$ pounds is 30% of the selling price. Hence \[m = 0.30 \times(7500 + m).\] Solve for $m$ and then $s.$ Make sure that you verify your answer, 



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