It costs $$400$ for a producer to manufacture a product that is distributed through wholesalers and retailers. The markups at the producer, wholesaler, and retailer levels are $20\%,20\%$ and $50\%,$ respectively. The wholesaler's selling price for the product is $\_\_\_\_\_\_\_\_\_\_,$ and the retailer's selling price is $\_\_\_\_\_\_\_\_\_\_.($A$)$ $$625$; $$1250($B$)$ $$576$; $$864($C$)$ $$480$; $$576($D$)$ $$500$; $$625($E$)$ Cannot be determined from the information provided.