At Xingguang Fruit Factory, the workers packed 750 boxes of apples on the first day, and 800 boxes on the second day. The packing fee was 90 yuan more on the second day than on the first day. How much was the packing fee on the first day?
星光果厂，工人们第一天包装750箱苹果，第二天包装800箱，第二天比第一天多得包装费90元，第一天应得包装费多少元？
<gadget id="calculator">800 - 750</gadget>
<output>50</output>

<gadget id="calculator">90 / 50</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">(9/5) * 750</gadget>
<output>1_350</output>

<result>1_350</result>