if the tax is 12% for example (t = 0.12), then what remains is 88% of your earnings. 1-t = 0.88. This is the number by which you should multiply your earnings.

what does (1 - tax) mean in this solution ?
im confused
how does it work ?
1 is used in many solutions. what does it express ? explain to me as if I were a child please

omg,it's easier than it looks,
after some hours i began to think not so confused,
keep it simple guys

sorry for this -_-