Hi, Safequip!
There's always a dual interpretation when applying a percentage to a number. There are 2 options, and both are correct (well, relatively):
a) =A1*(1-B1)
b) =A1/(1+B1)
being A1 the original amount or number (let us say 1000) and B1 the percentage (in this case 35%)
In my opinion in a) you're decreasing the value by a 35%, and that'll be my 1st choice, but there are people (usually vendors or resellers that add/subtract percentages chained/stacked to cost values) who think that b) is the correct case.
Whenever you're talking about little percentages (1%, 2%), the figures are very similar, which I think that it's the confusing concept, but when they're higher (as in this case, 35%) the difference is very notable.
Hope it helps.
Regards!