There are 676,000 possible PIN codes.
There are 26 letters in the English alphabet, and 10 digits.
26 * 26 * 10 * 10 * 10
676 * 10 * 10 * 10
6760 * 10 * 10
67600 * 10
676000
This is just multiplying and subtracting
So 19% in decimal is 0.19
so 27.37 x 0.19 = 5.2 (If not rounded it is 5.2003)
5.2 - 27.37 = 22.17 (If not rounded 22.167)
