Question

Please help me find out the answer I am request you to find out the and if you don't know the answer don't reply​

Answer 1

Step-by-step explanation:

21.

let x be his original salary

so increased in 20%= x+ 20%of x

= x+20/100 ×x

= x+ 0.2x= 1.2x

Now let y be the percentage that is to be reduced

So, 1.2x - y%of 1.2x= x ( original salary)

1.2x- y/100× 1.2x= x

1.2x(1- y/100)= x

1.2(100-y/100)= 1

1.2(100-y)= 100

120-1.2y=100

120-100= 1.2y

y= 20/1.2= 10/0.6= 100/6 = 16.6

16.6% must be reduced to restore the original salary.