A Lot Of Difference

You know if you get lets say an increment once every 2 years lets say about 12% , it is worst than getting 8% a year. The other day I was having this conversation with this dude, but this dude is seriously dumb. If you get 8% a year in 2 years u are getting 16% while the other dude only sees his / her 12% after 2 years. Don't you see the difference?

If simple maths also cannot count, hampak lor..............