the cost price of an article is 64 % of the marked price. calculate the gain percent after allowing a discount of 20 %?	Choose the correct choice from the following
A) 37.5 %
B) 48 %
C) 50.5 %
D) 52 %
E) 25 %
<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">80 / 64</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(5/4) - 1</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 100</gadget>
<output>25</output>

<result>E</result>
the cost price of an article is 64 % of the marked price. calculate the gain percent after allowing a discount of 20 %?
multiply(subtract(divide(subtract(const_100, 20), 64), const_1), const_100)
"explanation : let marked price = rs . 100 . then , c . p . = rs . 64 , s . p . = rs . 80 gain % = 16 / 64 * 100 = 25 % . answer : option e"