A July 4th promotion included a $5.00 mail-in rebate for the purchase of a picnic cooler and a store coupon for $0.50 off the price of a case of 24 cans of soda. For the company picnic, Carl Rhiel purchased a 48-quart cooler for $32.99 and a case of soda for $6.99. What did the cooler cost after the rebate if an envelope costs $0.20 and a Forever stamp costs $0.41?