I m not good in maths

[George TOUBALIS]

This the problem

I desigh a mini database for me.

I want to calculate the cost per print in my plotter

I found that

with 400% ink (CMYK) Field A

Print on 0.10 Squear meter Field B

my printer inkjet "3 ml" of my colours Field C

I want to put values in Fields A and B

to calculate the ml of printed colours (field C)

Is that possible???

George

[chemparrot]

It may be possible, but you haven't provided much information to go on. What kind of relationship is there between the %, area, and volume used? From one data point, isn't clear if this is a linear relationship or how the volume used varies when the % or area are changed.

[CoZiMan]

It's linear. That's what the 400% implies.

Your variables are:

% ink = A (CMYK)

If you use a bulk number for all four colors for the % you need to divide it by 4 before calculating.

We'll switch to a full square meter for simplicty, trust me.

B = Area(sq.m)

At 100% coverage of .1 meter you use 3 ml ink.

At 100% coverage of a full meter you use 30 ml of ink.

So your calculaion should be something like:

((A/4)/100)) * 30) * B

Sample:

If your coverage is 280% and your area is .5 sq meter:

.7 * 30 *.5 = 10.5

or per your example:

((400/4)/100)*30*.1 = 3ml

Got it?

PS -Glad you didn't ask for this in imperial measure ! (ft, in. etc.)

[comment]

IF it is linear (and I don't know how the 400% would imply that), then the formula can be simply:

Coverage * Area * constant

In the given example, if Coverage is entered as percentage (i.e. 400 means 400%), and Area is measured in square meters, constant will be 0.075:

400 * 0.1 * 0.075 = 3

[CoZiMan]

In my reply you'll see the 'A (CMYK)' representing the 4 colors of ink.

400% represents 100% of each color. Color on a piece of paper is not mutable.

We know that this is a calcualtion which is not measured over time or distance so there are no other mutable variables. I don't see how this could be anything but linear GIVEN the variables: A percent. An area. And a constant.

Your formula is correct, as is mine.

[comment]

I don't know what 'mutable variable' means. The assumption that 200% coverage consumes twice as much ink as 100%, and 400% twice as much again, sounds reasonable - but it is an assumption nevertheless.

We have been given a single point. You need at least three to indicate linearity. Even then it might be a coincidental knee of an exponential curve.