The original price of a computer is 5800 yuan, now the price is reduced by 20%, what is the current price?
一台电脑原价5800元，现在降价20%，现价多少元．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5_800 * (4/5)</gadget>
<output>4_640</output>

<result>4_640</result>