a trader bought a car at 30 % discount on its original price. he sold it at a 50 % increase on the price he bought it. what percent of profit did he make on the original price?  Options: A) 7 % B) 62 % C) 12 % D) 19 % E) 5 %
<gadget id="calculator">100 - 30</gadget>
<output>70</output>

<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">70 * 150</gadget>
<output>10_500</output>

<gadget id="calculator">10_500 / 100</gadget>
<output>105</output>

<gadget id="calculator">105 / 100</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">(21/20) - 1</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 100</gadget>
<output>5</output>

<result>E</result>
a trader bought a car at 30 % discount on its original price. he sold it at a 50 % increase on the price he bought it. what percent of profit did he make on the original price?
multiply(subtract(divide(divide(multiply(subtract(const_100, 30), add(const_100, 50)), const_100), const_100), const_1), const_100)
"original price = 100 cp = 70 s = 70 * ( 150 / 100 ) = 105 100 - 105 = 5 % answer : e"