Selected data from the September 26, 2020, and September 28, 2019, consolidated balance sheets and income statements (statements of operations) for the years then ended for Apple Inc. follow. All amounts are reported in millions.

Required:
a. Calculate the amount of Apple’s gross profit for each year. Has gross profit as a percentage of sales changed significantly during the past year?
b. Calculate the amount of Apple’s operating income for each year. Has operating income as a percentage of sales changed significantly during the past year?
c. After completing parts a and b, calculate the other missing amounts for each year.

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Net sales. Cost of sales. ... Research and development expenses Selling, general, and administrative expenses Operating income.. Other income, net.. Provision for income taxes. Net income... 2020 $274,515 169,559 18,752 19,916 ? ? 9,680 $ 57,411 2019 $260,174 161,782 16,217 18,245 ? 1,807 ? $ 55,256