bought a batch of suits at a price of 280.5 yuan each, and sold them at a price of 360 yuan each. Up to now, I have sold them (4/5), and I have made a profit of 300 yuan in addition to recovering all the purchase prices. How many suits are there in total?
我以每套280.5元的价格购进一批西服，又以每套360元的价钱出售，到现在已卖出了(4/5)，除收回全部进货款外还盈利300元．这批西服一共有多少套？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">360 * (4/5)</gadget>
<output>288</output>

<gadget id="calculator">288 - 280.5</gadget>
<output>7.5</output>

<gadget id="calculator">300 / 7.5</gadget>
<output>40</output>

<result>40</result>