The mass of freon-11 gas is m=0.597g m = 0.597 g .
That is, It looks fresh :D
Based on the information given, the ranking will be Vendor B, Vendor D, and Vendor C.
Vendor B must be the first vendor to be chosen because it is the dominant vendor across all the three vendors stated in the question and has better ratings when compared to other vendors.
Vendor D is the second choice of vendor since it outperforms Vendor C. Vendor C must be the third choice of vendor since, in case of flexibility and timely product shipment, vendor D outperforms it.
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