Question

a number is increased by 10%and then increased number is decreased by 10% find the net increase or decrease in the number

Answer 1

Let the original number be x.

 

Final number obtained = 110% of (90% of x) =(110/100 * 90/100 * x) = (99/100)x. 

 

x-(99/100)x=10

=> x =1000

Answer 2

number : x
increase : (110/100) X x
=(110x/100)
decrease = (90/100) X 110x/100
(99x/100)
total change
(110x-99x)/100
11x/100