I have a Cost that must be divided into 3 separate percentages that my company can bill against. We don't like to input any budget numbers into our accounting system that contain cents, so we round all of our numbers up or down manually so that they may be added up to equal the original total.

So if I have a cost of $17, and I have to divide it into 3 numbers (15%, 35%, & 50%), how can i create three separate formulas to automatically round the 3 numbers to the nearest whole dollar and still create a sum of $17?

Assume $17 = H35, 15% = H6, 35% = H7, & 50% = H8
I tried the following, which seems to not work for all total numbers:
=Rounddown(H35*H6,0)
=Roundup(H35*H7,0)
=Rounddown(H35*H8,0)

Any help would be appreciated