A book is priced at 75 yuan, the current price is fixed (4/5), how much is the current price.
一本书定价75元，现价是定价的(4/5)，现价多少元．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">75 * (4/5)</gadget>
<output>60</output>

<result>60</result>