Let be the random variable for the time a given person from the population spends sleeping. With we have

where .

Rounded to the nearest whole number, that comes out to about 31%.

I prepared and attached an excel spreadsheet because there is not enough room here. I rounded all numbers to the nearest dollar.

Explanation:

a. 26%

b. 28.2%

Explanation:

Consider the following formula:

Gross profit ratio = Net sales - Cost of sales / Net sales

Walgreen's 2015 gross profit ratio: (103444-76520)/103444

26.0%

Walgreen's 2014 gross profit ratio: (76392-54823)/76392

28.2%

44

Explanation:

Opening units 710

Started 8200

8910

Transffered -7650

Closing 1260

Cost Table

Cost opening current total complete WIP Equivelant cost

Headcost cost cost units units prod. units per unit

Material 8,000 138,000 146,000 7,650 1,134 8,784 16.6211

C C 7,000 324,000 331,000 7,650 882 8,532 38.7951 55.4163

(A) Compute learn on equity as follows:

Return on equity = (Net income/ Average stock holders’ equity) x 100

Return on equity = $9,938 / $47,771

Return on equity = 20.8%

Average stock holders’ equity = (48,663 + $46878)/ 2

Average stock holders’ equity = $47,771

Therefore, Return on equity is 20.8%

(B) Compute return on vet assets as follows:

ROA = (Net income / Average total asset) × 100

ROA = ($9,938/100,585) × 100

ROA = 9.88%

Average total asset = (110,903 + 90,266) / 2

Average total asset = $100,585

Therefore, Return on net assets is 9.88%

(C) Compute return on net operating assets as follows:

Return on net operating assets = (Net Operating income after tax / Average operating assets) × 100

Return on net operating assets = ($9,938 + 1,037) × 100 / 53,991

Return on net operating assets = ($10,975 / $53,991) × 100

Return on net operating assets = 20.33%

Average Operating assets = ($56,535 + 51,447) / 2

Average Operating assets = $53,991

Therefore, Return on net operating assets is 20.33%

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