# Do Steam coupons stack?

With all the coupons Steam has at the moment, do they stack?

And I don't mean 2x 50% = free, I mean mathematically correct as in 100% - (100% - 50%)² = 100% - 25% = 75% total discount.

• Actually, mathematically, (if the coupons worked that way) it would be 75% off. Like in department store clearance sales: take 50% off, then 50% off again. So `\$100 * 50% = \$50 off`; `\$50 * 50% = \$25 off`; `\$50 off + \$25 off = \$75 off`. – Krazer Dec 22 '11 at 16:14
• @Krazer precisely, leaving you with 25% of the original price. (I admit I wrote it down a bit sloppy, sorry) – Zommuter Dec 22 '11 at 16:17
• Tis okay~ I read "of" as "off." :P – Krazer Dec 22 '11 at 16:27
• @Krazer that would be a horrible deal: "Sir, I see you have a second 50% coupon, so you only get 25% off!":P – Zommuter Dec 22 '11 at 16:29
• @TobiasKienzler "Oh dear, you have three 50% coupons. Good thing it's discount period!" – badp Dec 23 '11 at 0:25

• At first I would think a bundle counts as an `item`, but on second thought it's likely considered literally: `a bundle of items`. – Kenan Dec 22 '11 at 15:51