3 A manufacturer of skateboards offered a 8/5/4 chain discount to many customers. Bob's Sporting Goods ordered is skateboards for a total $640 list price a. What was the net price of the skateboards? (Do not round intermediate calculations. Round your final answer to the nearest cent.) 00100 Net price b. What was the trade discount amount? (Do not found intermediate calculations. Round your final answer to the nearest cent.) Trade discount