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QUESTION 3 (20 MARKS) A shop wants to have a special sale where the customers would get a discounts of 20% and vouchers if they shop on special days, with the following terms Regular customers will get a discount when they shop on a weekend. Staff members will get the discount if they shop at the end of the month. Both types of customers will get additional voucher if their discount day falls on a public holiday Notes: In that year, there does not exist a day where all three events (weekend, end of the month and public holiday) falls on that day. (a) Design a combinational logic circuit for cashier machines in the shop to determine when the customers would receive the discount and vouchers. Hint there are four inputs and two outputs variables ] (b) Implement the circuit using NAND universal gates only (There are no limit to the number of input wires you want to use)