Onion Junior purchased a discounted dining voucher from a group-purchasing website. With only $100, he could enjoy the French foie gras and lobsters dinner set that was originally HKD$488. Yet, the condition stated, “The voucher is only valid within 90 days of the date of purchase. Customers must make a reservation two days in advance. ”
Onion Junior made a reservation two days in advance as required by the coupon. However, the waiter replied, “Sorry, it’s fully booked on that day.”
A few days later, Onion Junior called the restaurant for reservation again. The waiter replied, “Sorry, we’re fully booked this month. Please call again next month for reservation.”
Onion Junior asked the waiter, “It’s fully booked every time I call in for reservation. How many seats does the restaurant have?” The waiter replied, “We have a total of 80 seats and we have already reserved 30 seats for group-purchase customers.”
Onion Junior realized that a total of 8,000 dinning vouchers were sold after checking the group-purchasing website. He did a mental calculation, “There are 30 seats reserved for group-buy customers. Assuming they can serve two rounds of diners each evening, they can only serve 5,400 people in 90 days. The group-purchasing website oversold 2,600 vouchers.”