The banquet punch is $80/%$ water by volume, $12/%$ apple juice, and the rest is grape juice. If $240$ milliliters of grape juice were used to make the punch, then how many milliliters of punch is there total?

Given that the composition of the juice is such that:

80% is water

12% is apple

100 - (80+12) = 8% is grape juice:

total amount of grape juice made is 240 ml

The composition of the punch will be:

Amount = (percentage composition) x (total amount of juice)

Water=80/100x240=192 ml

Apple=12/100x240=28.8 ml

Grape juice=8/100x240=19.2 ml