New hospital employs 200 people on the nursing staff. sixty are nurse’s aides, seventy are practical nurses and seventy are registered nurses. nurse’s aides receive $ 15 an hour, practical nurses $ 25 an hour and registered nurses $ 30 an hour. what is the (weighted mean) hourly average wage of the nursing staff?

The total hourly payroll is ...

... 60×$15 + 70×($25 +30) = $4750

Then the weighted average hourly pay for a member of the nursing staff is ...

... $4750/200 = $23.75

20/27

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step-by-step explanation:

1 simplify brackets

-\frac{8}{9}\times \frac{5}{6}−

​9

​

​8

​​ ×

​6

​

​5

​​

2 use this rule: \frac{a}{b}\times \frac{c}{d}=\frac{ac}{bd}

​b

​

​a

​​ ×

​d

​

​c

​​ =

​bd

​

​ac

​​

-\frac{8\times 5}{9\times 6}−

​9×6

​

​8×5

​​

3 simplify 8\times 58×5 to 4040

-\frac{40}{9\times 6}−

​9×6

​

​40

​​

4 simplify 9\times 69×6 to 5454

-\frac{40}{54}−

​54

​

​40

​​

5 simplify \frac{40}{54}

​54

​

​40

​​   to \frac{20}{27}

​27

​

​20

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