The average (arithmetic mean) price of three items sold by a store to a particular customer, before discounts, was $90. If a discount of 20% was applied at the point of purchase to all items of at least $100, what was the total discount saved by the customer?
- The pre-discount price of the most expensive item that the customer purchased from the store was $180.
- The pre-discount price of the least expensive item that the customer purchased from the store was $10.