the cost price of an article is 64 % of the marked price. calculate the gain percent after allowing a discount of 15 %?	Choices:
A) 32.8 %
B) 37.6 %
C) 38.5 %
D) 17.5 %
E) 37.2 %
<gadget id="calculator">100 - 15</gadget>
<output>85</output>

<gadget id="calculator">85 / 64</gadget>
<output>85/64 = around 1.328125</output>

<gadget id="calculator">(85/64) - 1</gadget>
<output>21/64 = around 0.328125</output>

<gadget id="calculator">(21/64) * 100</gadget>
<output>525/16 = around 32.8125</output>

<result>A</result>
the cost price of an article is 64 % of the marked price. calculate the gain percent after allowing a discount of 15 %?
multiply(subtract(divide(subtract(const_100, 15), 64), const_1), const_100)
"let marked price = rs . 100 . then , c . p . = rs . 64 , s . p . = rs . 85 gain % = 21 / 64 * 100 = 32.8 % . answer : a"