Xiaojie's washing machine consumes (1/4) kWh of electricity per hour. Once, he used the washing machine to wash clothes for (4/5) hours, how many kilowatt-hours of electricity was used in total?
小杰家的洗衣机每小时用电(1/4)千瓦时．一次，他用洗衣机洗了(4/5)小时的衣服，一共用电多少千瓦时？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/4) * (4/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>