these silly made up questions for schools teach all the wrong things.
First, this family is paying NO taxes yet has income. This is so NOT America.
Second, only 23% for rent equals $552 a month. Please excuse me, but you can't rent a hovel in any American city or suburb [where almost all the students are] for $552 a month, much less space big enough for a family.
And then there's food. $480 a month for food !! unbelievable. just flat unbelievable. "Family" almost certainly means at least three people. $111 a week for three people's food hasn't been real in America for at least 15 years, more like 30.
In fact, 30 years ago is when I made 'only' 2400 a month and I was just starting out at the time -- didn't have a family. Any modern two income family makes more than 2400 a month.
I'm afraid your textbook is so badly out of date that it would be better used as charcoal starter or to train the new puppy.
and we wonder what is wrong with education in America?