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**technics** can someone please help me... i've got a silly question to ask..

i'm trying to calculate the percentage increase between 15000 and 16000; the answer i get is 6.25%, but when i try and increase 15000 by 6.25% I get 15937.5 ??? where am i going wrong?? furthermore if i try and decrease 16000 by 6.25% i get 1000 viz 15000!!??!

can someone please explain why a 6.25% increase on 15000 isnt 16000 and if it isnt what is the correct percentage increase??

sorry if i sound thick.. its been a long day.

thanks