[SNK]

” large teams took 8.92 months, and the small teams took 9.12 months. In other words, the large teams just barely (by a week or so) beat the small teams in finishing the project! Given that the large teams averaged 32 people and the small teams averaged 4 people, the cost of completing the project a week sooner with the large team is extraordinary: at $10,000 per person-month (fully loaded employee cost), the large teams would have spent $1.8M while the small teams only spent $245k. ”

9 x 32 x $10k != $1.8m, = ~$2.9m; 9 x 4 x $10k != $245k, = ~$360k.

[lutorm]

Did you read the entire article? It says that the numbers were made with the actual number of man-months worked, but not everyone was on the project the entire time.