15409 would be fifteen thousand four hundred and nine, 100203 would be one hundred thousand two hundred and three
let's say is "x", so "x" is then 100% of the whole bill.
we know 15% is 22.05, what is "x"?

(-2, 18) (-1, 14) (0, 10) (1, 6) (2, 2) (4, -6
Here is the answer to your problem
B.
-62 + 50 = -12
He is 12 dollars above the $50 limit, account will be closed.