Reinforcement cost of infantry generally follows the rule of:
Cost of unit (which is lower than actual call in cost for some spawning units)/number of entities*1/2
There few units that get a discount:
Obers 40 instead of 50
Pgs 34 instead of 42.5
SP 30 instead of 37.5
but considering that Obers are overpriced and SP/PGs are 4 men mid squads it makes sense. Assault engineer should have a discount also or a 5 member but the same DPS or a lower price.
