IAS11 Construction Contract (Technical Article)

Sir, could you kindly explain how to do below example 1 (Lily) from Technical Article with the method presented in your lectures?

Progress payments 1,400
Contract price 2,736
Work certified complete 1,824
Contract costs incurred to
31 December 2008 2,160
Estimated total cost at
31 December 2008* 2,520

The working for SoFP is same technique as in article
Cost YearToDate
+ recognised profit
– amount invoiced (which i assume is another meaning of progress payments)

but i cannot do the recognised profit for SoPL.

Im pretty much stuck with having a good approach to calculation since two evenings.

P.S.
On the other hand I was trying to do example 3 from your lectures with the technique presented in Technical Article but i couldnt get to Profit of 10.