Question 973492
<img src = "http://i.imgur.com/r9JciW5.png">


The original rectangle ABCD has a perimeter of 2*(L+W) = 2*(4+2) = 12 units.


Multiply the scale factor 2.5 by the perimeter of ABCD to get 2.5*12 = 30


Therefore, the perimeter of the enlarged rectangle A'B'C'D' is <font color="red">30 units</font>