The store buys a batch of bicycles, the purchase price is 400 yuan each, and the selling price is 500 yuan each. When 4 bicycles are sold (5/6), the full cost has been obtained. When all bicycles are sold out How much is the total profit?
商店购进一批自行车，购入价为每辆400元，卖出价为每辆500元，当卖出自行车的(5/6)少4辆时，已获得全部成本，当自行车全部卖完时，共盈利多少元？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(5/6) - (4/5)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">4 / (1/30)</gadget>
<output>120</output>

<gadget id="calculator">500 - 400</gadget>
<output>100</output>

<gadget id="calculator">120 * 100</gadget>
<output>12_000</output>

<result>12_000</result>