The original price of an electrical appliance is 4,000 yuan. The price is reduced by (1/10) and then reduced by (1/10). What is the current price?
一种电器原来售价4000元，先降价(1/10)后，又降价(1/10)，现价多少元．
<gadget id="calculator">1 / 10</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">4_000 * (9/10) * (9/10)</gadget>
<output>3_240</output>

<result>3_240</result>