Doudou received a total of 1,000 yuan in New Year's money during the Spring Festival. He plans to use (3/5) of the money to buy books and donate the rest to the Hope Project. How much did he donate in total?
豆豆春节期间共收到1000元压岁钱，他准备用这些钱的(3/5)买书，把剩下的钱捐给希望工程．他一共捐了多少钱？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1_000 * (3/5)</gadget>
<output>600</output>

<gadget id="calculator">1_000 - 600</gadget>
<output>400</output>

<result>400</result>