Set up a proportion:
[tex] \frac{3}{2.40} = \frac{16}{x}[/tex]
The numerator represents the ounces of cinnamon bought, and the denominator represents the cost of the cinnamon.
Cross multiply both fractions:
[tex]3x = 38.4[/tex]
Divide both sides by 3 to get x by itself:
[tex]x = 12.8[/tex]
Cinnamon will cost $12.80 per pound.
