Your code shouldn't be more complex than it really needs to be.
Obviously your writing is too simple, because he states the rule simply as "simplicity is the quality of code that is no more complex than required to express the underlying complexity".
TFA says "a new sensory input can be interpreted by a region of the brain that normally does something else," but isn't the input just being "converted" into the sense of touch by activating that region of the brain?
If the cost is x and the surcharge is y, then we need:
(x + y) *
y = x *
So the surcharge you should charge in this case would be y = 3.0928 (or in general, 3.0928% for a 3% credit card transaction fee).