by selling 22 pens for a rupee a woman loses 10 %. how many for a rupee should he sell in order to gain 50 %?	Pick:	A) 12	B) 14	C) 45	D) 13	E) 65
<gadget id="calculator">100 - 10</gadget>
<output>90</output>

<gadget id="calculator">100 / 90</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">(10/9) / 22</gadget>
<output>5/99 = around 0.050505</output>

<gadget id="calculator">(5/99) * 50</gadget>
<output>250/99 = around 2.525253</output>

<gadget id="calculator">(250/99) / 100</gadget>
<output>5/198 = around 0.025253</output>

<gadget id="calculator">(5/99) + (5/198)</gadget>
<output>5/66 = around 0.075758</output>

<gadget id="calculator">1 / (5/66)</gadget>
<output>66/5 = around 13.2</output>

<result>D</result>
by selling 22 pens for a rupee a woman loses 10 %. how many for a rupee should he sell in order to gain 50 %?
inverse(add(divide(divide(const_100, subtract(const_100, 10)), 22), divide(multiply(divide(divide(const_100, subtract(const_100, 10)), 22), 50), const_100)))
"d 90 % - - - 22 150 % - - - ? 90 / 150 * 22 = 13"