The Monster Who Did My Math

After a quick signature on a contract, the boy's problems are solved, and his homework is ready to turn in the next day. At first, everything adds up perfectly. But when the boy's math knowledge is tested at school, his troubles begin to multiply. What did the fine print on that contract read?

"In paragraph seven of clause ninety-three,
"If you don't learn anything, do not blame me "

When the bill comes due, will our hero have the money--and the math skills--to subtract that wicked monster from his life once and for all?