Question

the sum of number when a number is increased by 10% and decreased by 10% is 100 what is the number

Answer 1

let 1st no. be x

increase by 10%

x+x/10=11x/10

now decrease 10%

11x/10-(11x/10)/10=99x/100

the decrease is x-99x/100

x/100

decrease % is 1%