Find the Perimeter of the Figure If $a = 10 \mathrm { in } .$

Multiple Choice

Find the perimeter of the figure if $a = 10 \mathrm { in } .$ , $$b = 9 \mathrm { in }$$ .

A) 39 in.
B) 48 in.
C) 28 in.
D) 38 in.
E) none of these