I tried to understand this problem:
A high school football game had an attendance of 561, which is 19% more than last week. How many people attended last week's game?
I got:
(100+19)%=119%*561=1.19*561=667.59
Let number of attendees last week be A
Then number of attendees this week = A + .19A = 1.19A
Therefore, we get: 1.19A = 561
A, or number of attendees last week = . Round up to the nearest integer.