Deliveroo delivers food and groceries in the United Kingdom and Ireland. In May 2021, Deliveroo offered a voucher for a 20% discount on a purchase of at least 15 at specic Subway restaurants. (a) Construct a straight-line individual demand curve as follows. At a price of 5, the consumer would buyr three sandwiches, while, at a price of 4, she would buy ve sandwiches. (b) Why does the demand curve slope downward? (c) Suppose that the consumer does not use the discount voucher and the Subway price is 5. How many sandwiches would she buy and how much would she spend? (d) Now suppose that the consumer uses the discount voucher. What would be the price of sandwiches? How many sandwiches would she buy and how much would she spend? (e) Referring to (c) and (d), how would the voucher change the consumer's spending at Deliveroo