Xiaoli buys 4 balloons, one balloon (4/5) yuan, how much does it cost in total?
小丽买4个气球，一个气球(4/5)元，共需要花多少钱？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * 4</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>