Xiao Ming’s family used 150 kWh of electricity in February and 120 kWh in March. How many percent did you save electricity in March compared to February?
小明家二月份用电150千瓦时，三月份用电120千瓦时．三月份比二月份用电节约百分之几？
<gadget id="calculator">150 - 120</gadget>
<output>30</output>

<gadget id="calculator">30 / 150</gadget>
<output>1/5 = around 0.2</output>

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