What you'll need to do is put into your calculator is this exactly, parentheses and all:
What's happening here is the calculator will use order of operations to, first, solve what's in the parentheses. Then, the calculator will divide those enormous numbers because the question asks how many 'times' larger, which refers to division, and you'll get your answer. Sorry I couldn't show my work on this one. With numbers as large as this, it's better to enter them into your calculator.
area of part 1:
area of part 2:
area of part 3:
total shaded area : a1+a2+a3=41 ft2
total area of the reactangle : a=16*8=128 ft2
total area of the nonshaded region : 128-41=87 ft2