Question

The price of a gallon of unleaded gas has dropped to $2.81 today. Yesterday's price was $2.86 . Find the percentage decrease. Round your answer to the nearest tenth of a percent.

Answer 1

how do i add fractions?

Answer 2

To find the percentage decrease, you need to first find the decrease, and then find how much that is in relationship to the original value.

It dropped from $2.86 to $2.81, so the decrease is $0.05. You divide the decrease, $0.05, with the original price, $2.86, to find the percentage decrease. Multiply that value by 100 to get the value in percent.

Answer 3

I'm still bad with that kind of percents, but I kept a few notes on how to find the whole, part, or percent of a number. I think you divide the part by the whole.

Answer 4

part/whole = decimal percentage; x100 to get a normal percentage number

Answer 5

2.81
1- ---- = decimal percentage
2.86

decimal(100) = normal looking percentage :)

Answer 6

1.74... %

Answer 7

I divide the part by the whole then move the decimal 2 places to the right, which then becomes the percent.

Answer 8

of course then I would round the answer.

Answer 9

moving the decimal is not really a mathmatical solution; its more of a memory device :) but yes...

Answer 10

Heh, just something my teacher taught me. If there's a more precise way, I don't know it yet XD

Answer 11

for example:

.26 = 26/100

26
---- (100) = 26 is the math way; the memory way is
100 'move the decimal'