Billy spends $20on lunches during the week if this represents 45%of his weekly earningshow much money does billy earn in a week

Billy earns approximately 44 dollars in a week.

Step-by-step explanation:

Set up a percentage proportion, 45/100 = 20/x.

Cross multiply 100*20 and 45*x

100*20=2000

45*x=45x

Then divide both sides by 45.

45x/45=x and 2000/45=44.444444444444444444444

Therefore x ≈ 44