Question

The number 8000 is first increased by 20% and then decreased by 20%. Find the resulting number.

Answer 1

(8000×20)/100=1600

8000+1600=9600

(9600×20)/100=1920

9600-1920=7680

Answer 2

no.        increased by 20%
100                120
8000                x 

( cross multiply )
so ans. = 9600
 then,

no.       decreased by 205
100          80
9600          x
 ( cross multiply ) 
so ans. = 7680 

therefor , the final ans. is 7680