can you show all the calculations please?

4. DeWitt Co. sells a kitchen set for $475.00. To promote July 4th. DeWitt runs the following Ad: Beginning each hour up to the 4th hr, each kitchen set will be marked down l0%. But, at the end of each hour, we will mark up each set by 1%. Assume Mrs. Swenson buys a kitchen set 1 hr. and 50 min. into the sale. (a) What will she pay for the set? (b) What is the mark up percentage