Every day from 3:00 to 5:00 in the afternoon, the shopping mall will hold a limited-time discount event. The MP4 with a price tag of 900 yuan will earn 20% if it is sold at the original price.
商场每天下午3：00～5；00都要举行限时打折活动，标价为900元的MP4，打八折出售还要赚20%，如果按原价出售，要赚多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">900 * (4/5)</gadget>
<output>720</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">720 / (6/5)</gadget>
<output>600</output>

<gadget id="calculator">900 - 600</gadget>
<output>300</output>

<result>300</result>