The original price of a computer is 4,000 yuan, but the current price is reduced (2/5) from the original price. How much is the price reduction?
一台电脑原价4000元，现在的价格比原来降低了(2/5)，降价多少元？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4_000 * (2/5)</gadget>
<output>1_600</output>

<result>1_600</result>