 
 <translate> Give the step-by-step reasoning process and then the final answer. James buys 3 packs of candy. He pays with a $20 bill and gets $11 change. How much did each pack of candy cost? <hau> Bayyana tsarin tunani mataki-mataki sannan kuma amsar karshe. James ya sayi fakitin alewa guda uku. Ya biya da takardar dala 20 kuma ya samu dala 11 na canji. Nawa ne kudin kowane fakitin alewa? 