Positive number z

Positive number z is 10% greater than the number y. How many % is y smaller than z? Report the result rounded to one decimal place.

Correct answer:

p =  9.1 %

Step-by-step explanation:

$$\begin{gathered} z=1.1y \\ p=(z-y)\mathrm{/}z\cdot 100=100(1-y\mathrm{/}z)=100(1-y\mathrm{/}z)=100(1-1\mathrm{/}1.1) \end{gathered}$$

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