-

100/90= 1.111
100-1.111= 98.88

I am so confident of my answer because Americans are famously so good at math. :)

#

--------------------------------------------------
Note added at 14 mins (2016-04-26 14:34:28 GMT)
--------------------------------------------------

OK, probably price is more accurate than value here, but that's not the point. Questions very similar to yours are asked on a regular basis here and other forums. The thing is, in English we don't typically use 'factors' or multiplication to compare quantities, especially when the quantity of interest is less than some other. These ratios are usually expressed via a percentage.

Or "almost as low as 1 percent of its cost in..." This puts "more than" backwards, as "almost as little [low] as", just as one states the "less than" factor as the inverse of the divisor which is stated in Russian. Of course one can say "less than its cost in ... by a factor of greater than 90," but that is quite difficult to grasp.

Risking making this calculation before drinking coffee, and rounding to four places,
"90 times less than X" (doesn't work in English) = 1/90 of X = .0111 of X = 1.11 percent of X
"91 times less" - 1.10 percent
"92 times less" - 1.09 percent
"93 times less" - 1.08 percent
"94 times less" - 1.06 percent
"100 times less" - 1 percent

--------------------------------------------------
Note added at 37 mins (2016-04-26 14:56:51 GMT)
--------------------------------------------------

P.S. I didn't see Leigh's or Mikhail's posts when posting mine, because I was dawdling. We're all to the same point.

Among price, value and cost, I would still go with cost, but Leigh's solution avoids using any of those three.

---