Question

The cost of a laptop computer in 2007 was $1,250. In 2009, the price decreased to $1,100.

Answer 1

Given : The Cost of Laptop in 2007 is $1250

Given : The Cost of Laptop in 2009 is $1100

Decrease in Price of Laptop from 2007 to 2009 : (1250 - 1100) =  $150

A) Percent Decrease in the Price of the Laptop from 2007 to 2009 is :

$\mathsf{\implies \frac{Decrease\;in\;Price\;of\;Laptop\;from\;2007\;to\;2009}{Price\;of\;Laptop\;in\;2007} \times 100}$

$\mathsf{\implies \frac{150}{1250} \times 100}$

$\mathsf{\implies 12\%}$

Given : Decrease in Price of Laptop from 2009 to 2010 = $165

B) Percent Decrease in the Price of the Laptop from 2009 to 2010 is :

$\mathsf{\implies \frac{Decrease\;in\;Price\;of\;Laptop\;from\;2009\;to\;2010}{Price\;of\;Laptop\;in\;2009} \times 100}$

$\mathsf{\implies \frac{165}{1100} \times 100}$

$\mathsf{\implies 15\%}$