SOLUTION: Jessica wants to enlarge the dimensions of an 18-by-24-inch photo by 25%. What will be the perimeter of the enlarged photo?

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Question 1136468: Jessica wants to enlarge the dimensions of an 18-by-24-inch photo by 25%. What will be the perimeter of the enlarged photo?
Answer by ikleyn(52779) About Me  (Show Source):
You can put this solution on YOUR website!
.
The new perimeter = P%5Bnew%5D = 


    = L*(1+0.25) + W*(1+0.25) + L*(1+0.25) + W*(1+0.25) = (1+0.25)*(L + W + L + W) = 1.25*(24 + 18 + 24 + 18) = 1.25%2AP%5Bold%5D = 

    = 1.25*84 = 105 inches.       ANSWER


The lesson to learn from my post is THIS 

    Under this similarity enlarging, the new perimeter to the old perimeter ratio is the same 

    as the ratio of the new side length to the old side length