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It costs $1.50 to fill a spherical balloon with a radius of 4 inches full of helium.How much should you charge to fill a balloon full of helium with a radius of 9 inches?

Respuesta :

It's a rule of three problem, we have this:

[tex]\frac{1.50}{4}=\frac{x}{9}[/tex]

We need to clear x:

[tex]x=\frac{1.50}{4}\cdot9=\frac{13.5}{4}=3.375[/tex]

You should charge $3.375 to fill a balloon full of helium with a radius of 9 inches.