A dealer offers a cash discount of 20% and still makes a profit of 20% when he further allows 10 articles to be sold at the cost price of 9 articles to a particular sticky bargainer. How much percent above the cost price were his articles listed?
Pick:
A) 50%  B) 55%  C) 60%  D) 66+(2/3)%  E) 80%
Given   Cash 66+(2/3)%iscount - 20%   Profit - 20%   Items Sold - 10   Price Sold at = List Price of 9   Assume List price = $10   Total Invoice = $90   -20% Cash 66+(2/3)%iscount = $72   Let cost price of 10 items be x   So total cost = 10*x   Given the shopkeeper had a profit of 20%   10 * x * 120/100 = 72   or x = $6   Which means his products were listed at $10 which is a 66+(2/3)% markup over $6   Answer 66+(2/3)%
<result>D</result>
A dealer offers a cash discount of 20% and still makes a profit of 20% when he further allows 10 articles to be sold at the cost price of 9 articles to a particular sticky bargainer. How much percent above the cost price were his articles listed?