30% is 30 parts of an item split into 100 parts. 100/30 = 0.3
40% is 40 parts of an item split into 100 parts. 100/40 = 0.4
so 30% of 40% is :-
30 parts of (40 parts of an item split into 100 parts) = 100/30(100/40) = 0.3(0.4) = 0.3 times by 0.4 = 0.12 = 100/12 = 12%
Shocking I know, but the same really DOES go for 40% of 30%
