I have this problem. Googling 2 hours with no answers found, but propably searching wrong words - im really not not a math guy but need this for a plugin I write:
A price for a product is 150 OR below and the fee is 50% = 75
A Price for a product is 3000 OR Above and the fee is 10% ( and staying there ) = 300
The fee in % between 151 - 2999 should decrease in a smooth curve (50% to 10%)
How do I get the % for example 1400 ?
Thanks for any help / Jonas