6. The bookstore wants to restrict the total reward points across all books to 1000, which is less than the calculated reward points thus far. The only value that the bookstore can change is the threshold book price ($10.00) separating higher reward points (10 points for each dollar) and lower reward points (5 points for each dollar). Use Goal Seek to find out what the threshold book price should be so that the total reward points are 1,000. Accept what Goal Seek finds