By how much did the company’s cash balance change from the beginning of the year to the end of the y

By how much did the company’s cash balance change from the beginning of the year to the end of the year?What type of instruments does the company consider to be cash equivalent?Calculate the cash ratio. How does this ratio compare with the industry?http://s2.q4cdn.com/056532643/files/doc_financials/2016/annual/2016-Annual-Report-PDF.pdfWAL-MART Annual Report