A factory used 3 million kwh of electricity last year, but this year it has saved 25% of the electricity compared with last year. How many kwh will it use this year?
某工厂去年用电300万千瓦时，今年比去年节电二成五，今年用电多少万千瓦时？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">300 * (3/4)</gadget>
<output>225</output>

<result>225</result>