If you subtract 40% from a number, adding 40% doesn't bring it back to the original amount. That's not how math works.
I've counted 5 people in this thread who have the math wrong, so here's how it works in case math isn't your forte:
To calculate Gemini's wholesale price from their catalog price, you subtract 40% from retail, which, on a calculator, means multiplying by 0.6 or 60%. When you get a wholesale quote from Gemini, you don't multiply by 140% or 1.4 to bring it back up to retail. You divide by 60% or 0.6, or multiply by the reciprocal of 0.6, which is 1.667.