Hey guys, I understand everything up to the part where u add .40 to the denominator. I just can't think of it logically. If I added .40 to .72, wouldn't I be .12 over the family's total income since the May income is different from May's income?
think this way:
May: Mrs. Lee earned $60 and others earned $40 (total $100)
June: Mrs. Lee earned $72 (+20%) and others earned the same $40 (so, the total is $72+$40=$112).
So, Mrs. Lee's earnings is approximately 72/112=64% of the Lee family's total income in June