Answer
$\approx \$5.10$
Work Step by Step
We know that the perimeter of a rectangle is given by:
$P=2*side_1+2*side_2$
$P=2a+2b$
In this case, the perimeter is:
$0.9*2+2*2=4+1.8=5.8~meters$
We calculate the cost at $\$0.88/meter$:
$0.88*5.8\approx \$5.10$