$3.49 - $2.25 coupon = pay $1.24 + tax
get back $1.50 RR!
Note: You could check out in different transactions buying one at a time to get more than one. BUT, you cannot use the Register Reward to pay for another box of electrasol because the new RR will not print.
Check out all the detail in shopping the system at Walgreens in my Walgreens FAQ section.