Hi,

     .

A = Lw

.....Original width =  w and L = 3w

(3w+6)(w+8) - (3w)w= 108

3w^2 + 30w + 48 - 3w^2 = 108

30w = 60

w = 2   and L = 6 

......

P = 2L + 2w

P(original) = 2*2 + 2*6 = 16units 

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