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Four workshop workers had a basic hourly wage of € 8.50. Eight employees € 9.60, five employees € 10.90. What was the average basic hourly wage of workshop workers, and what will be if the hourly rates increase by 10%

Correct answer:

a =  9.72 Eur
b =  10.7 Eur

Step-by-step explanation:

$a=(4\cdot 8.50+8\cdot 9.60+5\cdot 10.90)/(4+8+5)=9.72\text{Eur}$

$b=1.10\cdot a=1.10\cdot 9.7235=10.7\text{Eur}$

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