You pay $3.69 for a gallon of gasoline. This is 90% of the price of a gallon of gasoline one year ago. What was the price of a gallon of gasoline one year ago?

100% is 6.21

Step-by-step explanation:

3.69/x=100/90

(3.69/x)*x=(100/90)*x       - we multiply both sides of the equation by x

3.69=1.1111111111111*x       - we divide both sides of the equation by (1.1111111111111) to get x

3.69/1.1111111111111=x

3.321=x

x=3.321

now we have:

90% of 3.69=3.321

3.321 turns into 6.21

2

step-by-step explanation:

yes

step-by-step explanation:

yes