A certain manufacturer increased its gross profit on a product from 10 percent of the cost of the product to 15 percent of the cost by changing the selling price. If the new selling price was $92.00 and the cost of the product remained the same, what was the old selling price?  Choose the correct choice
A) $77.40
B) $80.00
C) $83.64
D) $87.40
E) $88.00
Given that {cost of the product}*1.15=$92 --&gt; {cost of the product}=$80.   The old price was $ 80*1.1= 
<gadget id="calculator"> 80*1.1</gadget>
<output>88</output>
$88.   Answer: $88.00.
<result>E</result>
A certain manufacturer increased its gross profit on a product from 10 percent of the cost of the product to 15 percent of the cost by changing the selling price. If the new selling price was $92.00 and the cost of the product remained the same, what was the old selling price?