Answer:
Supplier B, and 1/36 $ or 0.02(7)
Explanation:
Supplier A
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To find the price of 1 balloon, it'd be $/balloons. By this logic, one balloon would be 29/1000 $ or 0.029$.
Supplier B
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One dozen is 12, 60*12=720, to find the price of one balloon, we'll use the equation we found earlier, $/balloons. That would equate the price of 1 balloon to 20/720, or 1/36 $, or 0.02(7).