City is size 24.

Trade route #1:

http://img505.imageshack.us/img505/6449/12260510oa4.jpg

This adds to +445%.
2 + (2 * 4.45) = 10.9. Rounded down?

Trade route #2:

http://img505.imageshack.us/img505/2804/94751573bl2.jpg

Also +445%.
1 + (1 * 4.45) = 5.45 WTF?

Can someone explain to me how the trade income is calculated?

What are the populations of Ollantaytambo and Lakamha? Maybe their populations make up for the difference?

I don't know hoew trade income is calculated (sorry), but isn't it possible that 1 is actually 1.9? That would explain it wouldn't it?

What are the populations of Ollantaytambo and Lakamha? Maybe their populations make up for the difference?

Ollantaytambo = 20
Lakamha = 17

I think those 1 and 2 commerce are rounded. Most of the displays in BtS that don't show decimal places round down (so the 1 might in fact represent anything up to 1.99).