Math / Algebra /

Question

The price of a gallon of unleaded gas has dropped to $2.78

 today. Yesterday's price was $2.84

. Find the percentage decrease. Round your answer to the nearest tenth of a percent.

Answer 1

the underlying formula that you want to use to compute percentage change is

(new - old) / old x 100%

for this scenario that means taking

(2.78 - 2.84) / 2.84 x 100% = -2.113%

meaning that the percentage decrease in the price of unleaded gas is 2.1%

Answer 2

The formula for a question like this is

Percentage Decrease = Difference of the prices X 100

Original Price

= 2.84 - 2.78 X 100

2.78

= 0.06 X 100 = 2.158% = 2.2% (Nearest tenth)

2.78