mjdibenedetto wrote:
what does the -1 mean?
That's simply algebra. In calculating a markup percentage you're essentially trying to calculate the difference between the Price and the Cost and then express that difference as a percentage of the Cost.
The difference is (Price-Cost).
Expressing that difference as a percentage of the cost could be done this way:
(Price-Cost) / Cost
Dividing the numerator and the denominator by Cost simplifies that expression to Price /Cost -1. The simplified expression often is used in "percentage of change" calculations. Just take the ending value and divide it by the beginning value, then subtract 1.
SG