Hello there, I am struggling to do this question using your overlapping sets matrix. How do you do this using the technique as described in the Word Problems book? At the beginning of each month, a certain book club offers its members the opportunity to purchase one or more books at a discount. At t...

Hello there, I am struggling to do this question using your overlapping sets matrix. How do you do this using the technique as described in the Word Problems book? At the beginning of each month, a certain book club offers its members the opportunity to purchase one or more books at a discount. At t...