4. The original price of a commodity is 1,000 yuan. After the price is increased by 20%, the price will be reduced by 20%. What is the current price?
4．一件商品原价1000元，提价20%以后，再降价20%，现价是多少元
<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">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_000 * (6/5) * (4/5)</gadget>
<output>960</output>

<result>960</result>