After giving a discount of rs.45 the shopkeeper still gets a profit of 20%,if the cost price is rs.180.find the markup %?  Choose one:
A) 0.4
B) 0.55
C) 0.45
D) 0.48
E) 0.58
cost price=180   s.p=180*120/100= 
<gadget id="calculator">180*120/100</gadget>
<output>216</output>
216   disc=45   so...mark price=216+45=261......   mark up%=261-180/180=81/180= 
<gadget id="calculator">81/180</gadget>
<output>9/20 = around 0.45</output>
.45 or 45%   ANSWER:0.45
<result>C</result>
After giving a discount of rs.45 the shopkeeper still gets a profit of 20%,if the cost price is rs.180.find the markup %?