something does not add up

This stock looks cheap on fundamentals but i am doubtful about the reality of the figures quoted in their profit forecast of $7.2m for 2008. 2007 revenue was $11.4 with a margin of 13.6% resulting in a net profit of $2m. First six months of 2008 saw an impressive increase in revenue to $14.8m. If we assume that will be repeated in the second half they will achieve full year revenue of $29.6m which using the same margin? gives a net profit of $4m not $7.2m. I know this is very simplistic but it does not add up to me. I would appreciate anyones comments who are more savvy in these matters than me thanks