if the cost price of 140 pencils is equal to the selling price of 100 pencils, the gain percent is  Choose the correct choice from the following:
A) 36  B) 37  C) 38  D) 39  E) 40
<gadget id="calculator">140 - 100</gadget>
<output>40</output>

<gadget id="calculator">100 / 40</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">100 / (5/2)</gadget>
<output>40</output>

<result>E</result>
if the cost price of 140 pencils is equal to the selling price of 100 pencils, the gain percent is
divide(const_100, divide(100, subtract(140, 100)))
"let c . p . of each pencil be re . 1 . then , c . p . of 100 pencils = rs . 100 ; s . p . of 100 pencils = rs . 140 . gain % = 40 / 100 * 100 = 40 % answer : e"