Question

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

A.) Find the percent decrease in the price of the laptop from 2007 to 2009.

B.) Find the percent decrease in the price of the laptop from 2009 to 2010 if the price decreased by $165 in 2010.

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 (Decrease\;in\;Price\;of\;Laptop\;from\;2007\;to\;2009)/(Price\;of\;Laptop\;in\;2007) * 100}`

`\mathsf{\implies (150)/(1250) * 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 (Decrease\;in\;Price\;of\;Laptop\;from\;2009\;to\;2010)/(Price\;of\;Laptop\;in\;2009) * 100}`

`\mathsf{\implies (165)/(1100) * 100}`

`\mathsf{\implies 15\%}`