the increase is additive, not multiplicative
all multipliers for specific currency of a specific type of multiplier share same variable, meaning sorting adds +15%, and filtering adds +5%, >> 20%, and so on...
so for example you have currently 410 (with multipliers), current % multi is 100% meaning previous number before applying this multi is 205, adding 15% = 115, so final number should be 440.75 not 471.5. in the end it depends on the actual formula and the order of the multipliers.