Question

Dear Stackoverflowers,

I would like to know what sollutions you can come up with for the following problem:

This is what I have:

13.90
5.03
7.06
2.51

This is what I want:

13.90
5.05
7.05
2.50

Basically: I want to round currency on a commercial base. There last decimal may only be rounded up to 5 or 10 (adding one to the first digit) or rounded down to 5 or 0.

Answer 1

A general formula for rounding to the nearest x:

round(input / x) * x

And an example for your use case:

round(5.03 / .05) * .05 = round(100.6) * .05 = 101 * .05 = 5.05