ROUNDDOWN if decimal values are equal to or less than .15?

Does anyone know how to ROUNDDOWN if decimal values are equal to or less than .15?

Basically, I want to apply the ROUNDDOWN function ONLY if my values in the decimals are equal to or less than .15, I want any figures with decimals greater than .15 to ROUNDUP.

Thank you in advance to anyone that writes in with a solution!

Is this going to work for a spreadsheet filled with dollar amounts? For example, my sheet consists of cells like this:

12.50
11.95
10.05
9.83
12.13
1.25
1.13

I need a formula that's going to scroll through these cells and ROUNDUP if the decimal place values are larger than .15, ROUNDDOWN if the decimal place values are equal to or less than .15

So values such as 1.13, 10.05 and so forth, all of these need to ROUNDDOWN. Values such as 12.50, 11.95 should ROUNDUP.

I am rounding to .5 from the dollar - so 1.13 would become .95, 10.05 would become 9.95. 12.50 would become 12.95.

Does this make sense?

Thank you for the assistance.

No, it didn't work - I tried it on a 4.35 and it converted the value to 5, instead of 4.95 (.5 from the dollar)

If the value were 4.15 or 4.12 it should ROUNDDOWN to 3.95 (.5 from the dollar).

Your recommendation worked perfectly - it rounds up or down based on the decimal values being lower or higher than .15!

Thank you very much for the help! Much appreciated!