Please answer this correctly

Answer:
= 16 12/13 mm
Step-by-step explanation:
To find the perimeter, we add all the sides
P = 4 3 /13 +4 3/13+ 4 3 /13 +4 3/13
Adding the whole numbers
4+4+4+4 = 16
Adding the fractions
3/13+3/13+3/13+3/13 = 12/13
Putting this back together
= 16 12/13 mm