I have paid the Admission Deposit of $7500 but haven't stated it in the Application. No they havent Included payroll or source of income only the bank statement. The Expense could be paid through assets like properties my parents hold.
Before you apply again:
Build a strong financial balance first. A bank balance over $30,000 would be viable.
Pay at least half of your tuition and include the receipt in your application.
You need to prove that your parents earn enough money to cover your tuition and expenses in a year. Show proof of assets your parents have and the income they get from these assets. (By attaching the title deeds, and tenant lease agreements etc)
Your parents need to write a letter of sponsorship detailing what they do for a living, how much they make and how much they intend to take from their earnings to support you. This letter should be notarized by a lawyer.
Write a letter of explanation detailing why you chose your program, the job prospects the program has in your country and how it would benefit your country.