Hello!I am trying to figure out the acid test ratio for Amazon.com for 2015.I cannot for the life of

me, choose the right numbers off the Security 10-K. 

Here is the formula I am using:

cash+short-term investments+net current receivables

divided by current liabilities.

Current Liabilities are: 33,899 in millions. I think cash is “cash and equivalents” but I am unsure as to whether or not to use the ending balance. 

Help is appreciated. Thank you. 

Here is the Sec 10-K link:

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