Your friend tells you that if you let her keep 202020 of your Pokemon cards for three months, she will give you 222 cards extra when she returns your cards to you. What is the annual rate of interest she is willing to pay for the borrowed cards?
Note: Even though she only keeps your cards for three months, we can still calculate an annual interest rate.

y = i/2 xtnop + (3i/2 tnop+ 1)

step-by-step explanation:

the picture is the step by step explanation.

a.) list the factors of 40.

1/2/4/5/8/10/20/40

b.) list the factors of 40 that represent the number of cans that could be on each shelf.

5

c.) how many different arrangements of cans are possible?

just one because if you put more on one shelf you will go way over 40 and the cabinet will probably break.

d.) what are the possible arrangements of the cans?

put 5 cans on each self to reach 40 cans in total.

e.) which arrangement uses all the shelves?

5 because you can put 5 cans on each shelf, and since there are 8 shelfs you are equally going to get 40 cans.