You require 20 gel-ink pens. STORE XXX sells these pens at R 9.50 each, while store YYY sells them at
R 10.00 each, but have a 6% sale on all items. Further, store WWW sells these pens at R 19.00 each with a buy one get one free special. Finally, store MMM sells the pens at R 14.50 each with a third off the total price.
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