Use the following figure to answer the question :
-Given the information in the above graph, (a) does the price of $20 represent a price floor or a price ceiling, (b) is there a shortage or a surplus and (c) how much is it? 
Definitions:
Interest
The charge for borrowing money or the return on investment for lending money, typically expressed as a annual percentage rate.
Investments
Funds committed into ventures with the expectation of earning a return or profit.
Withdraw
To withdraw means to take out funds from an account, remove participation in an activity, or retract from a position or commitment.
Retire
To withdraw a financial instrument from circulation, or for an individual to leave the workforce and cease employment.
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