Micah, since the package prices are based on the same 5% discount as is applied to buying five or more items, you'd discount the 800 price by 5% and subtract the discounted 600 price from it to get the difference, or just take .95 times the non-discounted difference of $540 to get the additional $513 needed. Check with Axiom of course, so that no confusion results.

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Enjoy the music, not the equipment.