A portion of an embankment having a uniform upgradient 1 in 500 is circular with radius 1000m of the centre line.If the height of the bank is 1m at the lower end,and side slopes 2:1,the earth work involved

- 1
  
  26,000 $m^{3}$
- 2
  
  26,500 $m^{3}$
- 3
  
  27,000 $m^{3}$
- 4
  
  27,500 $m^{3}$

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