A basketball is 80 yuan, sold at 35% off, how much is the current price?
一个篮球80元，按六五折出售，现价多少元．
<gadget id="calculator">65 / 100</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">80 * (13/20)</gadget>
<output>52</output>

<result>52</result>