I sold a book at a profit of 10%. Had I sold it for $110 more, 15% would have been gained. Find the cost price?	Choose the correct choice:
A) $2000  B) $2200  C) $3000  D) $3120  E) $1540
115% of cost - 110% of cost = $110   5% of cost = $110   cost = 110*100/5= 
<gadget id="calculator">110*100/5</gadget>
<output>2_200</output>
$2200   Answer is $2200
<result>B</result>
I sold a book at a profit of 10%. Had I sold it for $110 more, 15% would have been gained. Find the cost price?