Find the percent of change from $240 to $320

320/240 = 1.33

1.33 = 133% (move the decimal point over two places to the right)

133% is your answer

hope this helps

Find the difference between $240 and $320.  It's $80.

Then the percentage change was

$80
* 100% = +33.33%
$240

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's