This is part of the Semicolon&Sons Code Diary - consisting of lessons learned on the job. You're in the algorithms category.
Last Updated: 2023-03-28
I had to convert the taxation percentages given online from the government
format (1.025% employer, 3.3% total) into a proportional component that worked
with our legacy code. At first, I wrote the proportion of employer tax compared
to the total as (1.025/3.3) as
0.31, chopping off a load of digits at the end.
This, however, was inaccurate, especially with larger figures. I should have
used the full number from the calculation -
0.310606. The reason I didn't put
this in initially was because I was rounding to 2 significant digits. But this
rounding should only occur at the latest possible time.