Xiaojun's household uses an average of 5 kWh of electricity per day. After switching to energy-saving lamps, the daily electricity consumption is 60% of the original. How many kWh is the average daily electricity saving?
小军家平均每天用电5千瓦时，改用节能灯后，每天的用电量是原来的60%，平均每天节电多少千瓦时？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">5 * (2/5)</gadget>
<output>2</output>

<result>2</result>