Golfer$$s Delight was to hold a summer spectacular event during

which a celebrity golfer would be autographing golf bags for

anyone

purchasing the Pro Spirit line of clubs. To prepare for the event,

the buyer purchased $15$ additional sets of clubs to be priced at

$$400.$

There were already $10$ sets of the clubs in stock but they were

repriced from $$350$ to $$400$ for consistency. The event was

very

successful and all of the clubs sold. What was the additional

markup percent earned on the clubs already in inventory? What was

the

total net sales on all clubs during the event?