First we need to find the measure of the length.
The length is bigger then the width in this case so we will multiply 125% by 8.
Lets convert 125% ==> decimal form
125% = 1.25
Note : simply move the decimal point two places to the left

So the length is 10 meters long.
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Now since we know the length we can find the area of the rectangular - like garden.
A = bh or in this case, A = lw

Multiply :

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I hope that helps you out!!
Any more questions, please feel free to ask me and I will gladly help you out!!
~Zoey