Solve the proportion using cross products. Round to the nearest hundredth if necessary. $18.45/m gal = $3.60/7.5gal

[tex] \dfrac{\$18.45}{n \text { gallon}} = \dfrac{\$3.60}{7.5 \text { gallon}} [/tex]

Cross multiply
[tex]n \times \ 3.60 = 7.5 \times \ 18.45[/tex]

Combine like terms
[tex]3.60n = 138.375[/tex]

Find n
[tex]n = 138.375\div 360[/tex]

Answer
[tex]n = 0.38 \text { (nearest hundredth)}[/tex]