Question

Mark bought a car for x dollars. One year later the car was 0.85x. What was the percent decrease.

Answer 1

thr percent decrease is 15%

Explanation:

you get 1.00 which represent beginning price u subtract the current price 1.00-0.85 you get0.15 which is 15%

Answer 2

`Let~the~percentage~decrease~be~equal~to~y.\\Then,\\0.85x = x-(y)/(100)(x)\\or, 0.85x = x-0.01xy\\or, 0.85x = x(1-0.01y)\\or, 0.85 = 1-0.01y\\or, 0.01y = 1-0.85 = 0.15\\or, y =15\\So, ~the~decrease~of~the~price~is~15%.`

Alternative method:

`Percentage~decrease = (Initial~Rate-Final~rate)/(Initial~Rate)(100) \\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=(1-0.85)/(1)(100) = 0.15(100)=15`