not sure if i understand correctly
multiplicatively from at math stand point means lvl is 1x1=1
lvl 2 is 1x2=2
lvl 3 is 2x3=6 (lvl 2xlvl3)
lvl 4 is 6x4=24 (lvl3xlvl4)
is this right? if not please make sense!

Base value x (% increase per level x level) = total