By what percent is the change in price if: the price was $250 and now is $100

60 percent decrease

Change in price = new - old = 100 - 250 = -150

The negative change means the price has gone down

Divide this change in price over the original 250 and convert to percent form

(change in price)/(original price) = -150/250 = -0.60

which converts to -60%

The negative percent change in price indicates a price decrease

So the price goes down by 60% meaning that it lost 60% of its value

Note how 60% of 250 is 0.60*250 = 150 which was the change in price computed earlier.

goog may have it for you

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.