Big Sale

One of my most visited shops is having final sale. Couldn't have benefited as I already got what I wanted before the bigbig sale. So I asked Dad to take a look 'cos he may want something.

m: extra 5% off if pick 3 pcs; extra 10% off if pick 4 pcs...
d: oh well... then don't have to pay if I hunt down the whole store...?