Qingqing Company donates to primary schools four times a year, the first donation is 8 yuan more than the total amount (1/5) of the year, the second donation is 4 yuan less than the remaining amount (3/10), and the third The first time was 16 yuan more than the remaining amount (1/50), and the fourth time I donated all the remaining 180 yuan. How much did Qingqing Company donate in a year?
青青公司一年分4次捐款给小学，第一次捐助比全年总数额的(1/5)多8元，第二次捐款数比剩下金额(3/10)少4元，第三次比剩下金额的(1/50)多16元，第四次把剩下的180元全部捐出，青青公司一年捐了多少钱？
<gadget id="calculator">490 + 8</gadget>
<output>498</output>

<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">498 / (4/5)</gadget>
<output>1_245/2 = around 622.5</output>

<result>1_245/2 = around 622.5</result>