$828.$ DeWitt Company sells a kitchen set for $$475.$ To promote July $4,$ DeWitt ran the following advertisement: Beginning each hour up to $4$ hours we will mark down the kitchen set $10\%.$ At the end of each hour, we will mark up the set $1\%.$ Assume Ingrid Swenson buys the set $1$ hour $50$ minutes into the sale. What will Ingrid pay? Round each calculation to the nearest cent. What is the markdown percent? Round to the nearest hundredth percent. LU $8-3(1)$