There is a batch of coal in a certain factory. It was originally planned to burn 0.25 tons per day, which can be burned for 80 days. The actual daily saving is 20% compared with the original plan. How many days can it actually be burned?
某工厂有一批煤，原计划每天烧0.25吨，可烧80天，实际每天比原计划节约20%，实际可以烧多少天？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">0.25 * (4/5)</gadget>
<output>0.2</output>

<gadget id="calculator">1 - 0.2</gadget>
<output>0.8</output>

<gadget id="calculator">0.25 * 0.8</gadget>
<output>0.2</output>

<gadget id="calculator">80 / 0.2</gadget>
<output>400</output>

<gadget id="calculator">0.25 * 400</gadget>
<output>100</output>

<result>100</result>