Contract Asset

Hi There seems to be two ways to recognise a contract asset, both producing different answers. 1) Revenue recognise based on % completion x Amounts invoiced/received (x) Contract Asset x 2) Costs incurred to date x Profit based on % completion x Less amts invoiced/received (x) Contract Asset x Which one is best to use in a question when info for both is available? BPP practice kit Haverford Co p,137. I calculated contract asset as: 5,600,000-1,400,000 = 4,200,000 Solution: 1,900,000 + 2,000,000 - 1,400,000 = 2,500,000