A store bought 1,000 children's toys, some of which were damaged during transportation. When selling, good toys that are not broken earn 50% of the profit, and damaged toys lose 10% and are sold at a reduced price. After the sale, the profit rate of this batch of goods is 39.2%. How many good toys did the store sell?
商店买进1000个儿童玩具，运输途中破损了一些．销售时，未破损的好玩具赚取了50%的利润，破损的玩具则亏损10%降价出售．卖完后一结算，这批货的利润率为39.2%，商店卖出好玩具多少个？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1_000 * (1/10)</gadget>
<output>100</output>

<gadget id="calculator">39.2 / 100</gadget>
<output>0.392</output>

<gadget id="calculator">1_000 * 0.392</gadget>
<output>392</output>

<gadget id="calculator">392 - 1_000</gadget>
<output>-608</output>

<gadget id="calculator">100 + 1_000 + (-608)</gadget>
<output>492</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/10) - 1</gadget>
<output>-9/10 = around -0.9</output>

<gadget id="calculator">1 + (1/2) + (-9/10)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">492 / (3/5)</gadget>
<output>820</output>

<result>820</result>