Question

answer please fast ​

Answer 1

Let the original no. be 100

After increase = 100+10%of 100

=110

After decrease =110-10%of 110

=99

Original no. =100

Final no =99

Change =1

Change %=1/100*100

=1%

Answer 2

Method 1

let amount = 100

10% increased= 110

10% decreased means 9/10 of 110

= 99

new amount = 99

variation = 1

Method 2

let amount 100%

apply formula

x+y+xy/100 where x= +10 , y= -10

= -1%

means 100%-1% = 99% amount = 99

and variation = 1