A kind of electric fan is 300 yuan, the price has been reduced twice, the first time it is sold at a 20% discount, and the second time the price is reduced by 10%. How much is the final price of this fan.
一种电扇300元，先后两次降价，第一次按八折售出，第二次降价10%．这种电扇最后售价多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">300 * (4/5) * (9/10)</gadget>
<output>216</output>

<result>216</result>