Mohit sold an article for $18000. Had he offered a discount of 10% on the selling price, he would have earned a profit of 8%. What is the cost price of the article?  Pick.
A) 16000
B) 25000
C) 15000
D) 18000
E) 17000
C   15000   Let the CP be $x.   Had he offered 10% discount, profit = 8%   Profit = 8/100 x and hence his SP = x + 8/100 x = $1.08x = 18000 - 10/100(18000) = 18000 - 1800= 
<gadget id="calculator">18000 - 1800</gadget>
<output>16_200</output>
$16200=&gt; 1.08x = 16200   =&gt; x = 15000
<result>C</result>
Mohit sold an article for $18000. Had he offered a discount of 10% on the selling price, he would have earned a profit of 8%. What is the cost price of the article?