Multiplication calculation in square meters

I need to do a calculation to estimate the value of a property, for this I need to multiply the square meters with the neighborhood, for this I already have everything, but when I get to the result it seems that it just adds up, is it possible to configure a multiplication or define custom calculations?
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For example:
Neighborhood : Lages 
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Example 50 (m2) x Lages (R$23,08 = Approximate Rent = R$ 1154,00.
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How can I get a similar result in the end?

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