Jerry Witherspoon lived in the City of Columbus, Ohio. He studied in the Miami University and is doing his internship with David James & Partners, an accounting firm that specializes in Governmental and NonProfit Accounting. David James, the Managing Partner of the firm has given Jerry a few tasks to complete as follows:

(a) To write an explanation of what are the four types of nonexchange revenues.

(b) To write an explanation about the definition, uses and purpose of Debt Service Funds.

(c) To write an explanation about the definition of Permanent Funds, its example and its difference with Private Purpose Trust Fund.