Question

a number when decreased by 20 percentage gives 80 .find the number...
formula, D=(1-x/100)A...​

Answer 1

Step-by-step explanation:

let the number be x

according to problem

X- 20% =80

X-20/100 =80

100X-20/100=80

100X-20=80×100=8000

100X=8000-20=7980

X=7980/100

X=79.8

hence number be X = 79.8