Under her cell phone plan Vani pays a flat cost of 69 per month and 4 per gigabyte She wants to keep her bill at 76 60 per month Which tape diagram could be used to represent the context if a represents the number of gigabytes of data Vani can use while staying within her budget A B C D 4 4 69 4 4 4x 4 4x 69x 69 72 6 69 76 6 4 72 6 4 69 76 6 69 69x 69 69 69 4