The daily power consumption of an ordinary refrigerator is 0.8 kWh, and the electricity bill is 0.75 yuan per kWh. Energy-saving refrigerators consume 0.24 kilowatt-hours of electricity per day. Can energy-saving refrigerators save more electricity bills a day?
普通冰箱一天的耗电量是0.8千瓦时，电费每千瓦时0.75元．节能冰箱每天的耗电量是0.24千瓦时，节能冰箱一天能节约电费多收元？
<gadget id="calculator">0.75 * 0.8</gadget>
<output>0.6</output>

<gadget id="calculator">0.75 * 0.24</gadget>
<output>0.18</output>

<gadget id="calculator">0.6 - 0.18</gadget>
<output>0.42</output>

<result>0.42</result>