The fourth, fifth and sixth grades of Yongsheng Primary School donated a total of 2,040 yuan, of which the donation for the fourth grade was 3/4 of that of the sixth grade, and the donation amount for the sixth grade (4/5) was exactly the same as that of the fifth grade. How much is the sixth grade donation?
永胜小学四、五、六共捐款2040元，其中四年级的捐款是六年级的(3/4)，六年级捐款额的(4/5)与五年级刚好相等．六年级捐款多少元？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">1 + (3/4) + (4/5)</gadget>
<output>51/20 = around 2.55</output>

<gadget id="calculator">2_040 / (51/20)</gadget>
<output>800</output>

<result>800</result>