Alexander's estimate for the cost of the campaign was nothing to scoff at.
For the entire duration of the offensive, he promised to give the 10,000 professional soldiers 150 ropals per month on top of their free food and equipment, which was 50 ropals more than they received in peace times.
And the levies were promised the same supplies, but 5onlt 0 ropals a month.
After all, they were neither as skilled nor disciplined as their counterpart.
And although only 50 ropals might sound very low, this was actually much more than the standard rate.
Typically levies were paid mostly in loot and booty, with just enough food and supplies given to them so that they could keep fighting.
So Alexander giving them this much money of which the men were saving every penny was really generous.
As for context, a farmer with a family typically needed 6 months to save that much.
Now Alexander did not do it only out of altruistic reasons,