A computer producer sold a certain brand desktop computer to a wholesaler at a unit price of $400. This wholesaler took the cost-plus pricing strategy by setting a 10% markup rate and then sold it to a retailer. This retailer also took the cost-plus pricing strategy by setting a markup rate of 20% and then sold it to the end consumer. As such,

(1) At what price did the retailer buy this desktop computer from the wholesaler? 

(2) What price did the end consumer buy this desktop computer from the retailer?