We’ll cover your tuition until you get hired. This means that you'll pay your tuition only after you find a job making more than $40K a year (i.e., $3333 a month). Only then, you will pay 10% of your income each month, until you have fully paid the tuition cost of $15,000.
Five years after you graduate, you will not need to make any additional payments, regardless of how much you already paid. If you didn't find a job earning more than $40,000/year you pay $0.
The total amount you pay for your tuition will be $0-$15,000, depending on your income. You will not make more than 40 monthly payments, even if you didn't pay the full tuition.