217900-(71100+62600+42750-11900+12300)=41050
Asset = Liability + Equity
Detail of Equity by the end of 2011: Common Stock = 71100+12300 = 83400
Retained Earning =62600+42750-11900 =93450
Total Equity 176850
So Liability = 217900 (asset by the end of 2011)- 176850 (total Equity) = 41050