Question: Design a combinational circuit using a subtractor that calculates the change to be returned when a customer inserts more money than the product price. Use

Design a combinational circuit using a subtractor that calculates the change to be returned when a customer inserts more money than the product price. Use the coin values inserted as inputs and the product price as another input, with the output being the change amount.

a $)$ Show the truth table.

b $)$ Determine the logic expressions, and minimized SOP forms.

c $)$ Implement the circuit using basic logic gates and a subtractor.

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