Question

The cost of a gallon of gas increased by 25%, if today's price is $2.68, what was the original price before the increase?

Answer 1

Let:

x = original price

y = Today's price = $2.68

Therefore:

`\begin{gathered} x+x*0.25=2.68 \\ \text{Factor:} \\ x(1+0.25)=2.68 \\ \text{Solve for x:} \\ x=(2.68)/(1+0.25) \\ x=2.144 \end{gathered}`

So, the original price was $2.144