The Jiarunduo store bought 1,500 repeaters, sold them on the first day (1/5), and sold the rest (3/8) on the second day and there were 50 more units. How many units were bought on the second day?
家润多商场进了1500台复读机，第一天卖出(1/5)，第二天卖出剩下的(3/8)还多50台，第二天买了多少台？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1_500 * (4/5) * (3/8)</gadget>
<output>450</output>

<gadget id="calculator">450 + 50</gadget>
<output>500</output>

<result>500</result>