a dishonest dealer professes to sell goods at the cost price but uses a weight of 720 grams per kg, what is his percent?  Choose the correct choice from the following answers:
A) 15 %
B) 25 %
C) 38.9 %
D) 45 %
E) 35 %
<gadget id="calculator">100 / 720</gadget>
<output>5/36 = around 0.138889</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">100 * 10</gadget>
<output>1_000</output>

<gadget id="calculator">(5/36) * 1_000</gadget>
<output>1_250/9 = around 138.888889</output>

<gadget id="calculator">(1_250/9) - 100</gadget>
<output>350/9 = around 38.888889</output>

<result>C</result>
a dishonest dealer professes to sell goods at the cost price but uses a weight of 720 grams per kg, what is his percent?
subtract(multiply(divide(const_100, 720), multiply(const_100, multiply(add(const_3, const_2), const_2))), const_100)
"explanation : 720 - - - 280 100 - - - ? = > 38.9 % answer : c"