Chander Bookstore, is a student co-op. Chander Bookstore uses a perpetual inventory system. The following transactions (summarized) have been selected for analysis:

a. Sold merchandise for cash (cost of merchandise $157,670).	$ 286,000
b. Received merchandise returned by customers as unsatisfactory (but in perfect condition) for cash refund (original cost of merchandise $616).	1,660
c. Sold merchandise (costing $9,360) to a customer on account with terms n/30.	20,800
d. Collected half of the balance owed by the customer in (c).	10,400
e. Granted a partial allowance relating to credit sales the customer in (c) had not yet paid.	1,180
f. Anticipate further returns of merchandise (costing $208) after month-end from sales made during the month.	740

Compute the gross profit percentage. (Round your answer to 1 decimal place.)