Jim bought 2 packs of batteries from a store. The price of each pack was the same. After he bought the batteries, his account balance showed a change of −$23.94. What would have been the change to Jim's account balance had he only bought 1 pack of batteries from the store?
 Answers available: 
 −$21.94
 −$11.97
 $11.97
 $21.94 
 HELP ASAP. 50 POINTS