Express each of the following as a percentage of total revenues for 2013 and 2014. Indicate if you believe the percentages have changed substantially.

A. Cost of sales B. Depreciation, depletion and amortization expenses C. Income before taxes D. Income taxes E. Net income from continuing operations Questions A5 to A8 use Tables 4.14 and 4.15. These questions all deal with Occidental Petroleum, a major oil company. You will notice that Occidental Petroleum has discontinued some operations. The effect of these operations is shown on each year’s financial statements in a single line, so that you can do ratio analysis using data for the continuing operations.

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Table 4.14 Occidental Petroleum Consolidated Balance Sheets (USD $) In millions, unless otherwise specified CURRENT ASSETS Dec. 31, Dec. 31, 2013 2012 Cash and cash equivalents $3,393 $1,592 Trade receivables, net of reserves 5,674 4,916 Inventories 1,200 1,344 Other current assets 1,056 1,640 Total current assets 11,323 9,492 INVESTMENTS IN UNCONSOLIDATED ENTITIES 1,459 1,894 PROPERTY, PLANT AND EQUIPMENT Oil and gas segment 72,367 65,417