Columnar calculation: the original price of a basketball is 80 yuan, how much is it when it is sold at a 15% discount?
列式计算：一个篮球原价80元，八五折出售时多少元？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">80 * (17/20)</gadget>
<output>68</output>

<result>68</result>