If he never owns more than one packet of each at a time, then two of the blue every month, and one of the white, which turns out to be... hmm, whadda ya know, $55.80. Yes, eventually, after about seventeen months, he would be able to skip buying a bag of the blue ones, but sixteen out of those seventeen months he would be required to spend exactly $55.80, without tax. And being able to save the extras depends entirely on the pill's expiration date, which could be as much as ten years or as little as one month, meaning he would ALWAYS pay $55.80.
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