Question 386973
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Hi,         
Let x and (4x-50) represent the width and the length respectively
Question states***
12,000 = x + x + (4x-50) + (4x - 50)
solving for x
 12,000 = 10x - 100
  12,100 = 10x
   1210 = x, the width.  the lenth is 4790    (4*1210 -50)

CHECKING our Anwer
 2*1210 + 2*4790 = 2420 + 9580 = 12,000