Edgar has a balance of $1590 on a credit card with an APR of 22.74%, compounded monthly. About how much will he save in interest over the
course of a year if he transfers his balance to a credit card with an APR of
18.49%, compounded monthly? (Assume that Edgar will make no payments
or new purchases during the year, and ignore any possible late payment fees.)

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

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

i think the correct option is the second option.

it’s the first one your welcome