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The two vendors that make up a combined sales of 70% are Gameday Grub and Ally's Eats.
Percentage can be described as a fraction of a quantity that is usually expressed as a number out of hundred. % is the sign that denotes percentages.
Percentage of Bob's Snack Shack and Ally's Eats boxes sold = [(900 + 1350) / 3000] x 100 = 75%
Percentage of Bob's Snack Shack and Gameday Grub boxes sold: [(900 + 750) / 3000] x 100 = 55%
Percentage of Gameday Grub and Ally's Eats boxes sold: [(1350 + 750) / 3000] x 100 = 70%
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