Q: How do 'you' calculate the cost per effective chlorine between liquid versus powder?

[EDIT] Apparently this is the calculation to get price per available chlorine:

a) liquid chlorine: $cost/gallon x 1gallon/9.7pounds x 1/10.8% by wt available chlorine

b) liquid bleach: $cost/gallon x 1gallon/9.0pounds x 1/5.7% by wt available chlorine

c) solids: $cost/pound x 1/xx% by wt available chlorine, as listed on the container

If the available chlorine percentage isn't listed, call the company or assume 36% as a worst case[/EDIT]

After googling, I find most answers say it fundamentally doesn't matter whether you use liquid (6% or 12%) chlorine or powder (56%-62% for dichlor or 90%-98% for trichlor, effective 85%).

The articles I found warn of other things (e.g., CYA isn't in the liquid & liquid raises the pH); but fundamentally they say the result is the same when it comes to ions of chlorination.

My problem is trying to compare the cost per effective pound of chlorine between liquids & solids.

Of course, costs vary greatly, so it's the EQUATION that matters. I can easily write the equation to compare the powders - but I'm having trouble comparing cost of powders versus liquids.

For example, to compare the cost for effective chlorine between two dichlors is easy.

Given$3.00 per pound of 56% dichlor versus $3.33 per pound of 62% dichlor:

FIRST CALCULATION: 56% dichlor at $3.00/pound x 100/56 = $5.36/pound effective chlorine

SECOND CALCULATION: 62% dichlor at $3.33/pound x 100/62 = $5.37/pound effective chlorine

COMPARISON: These two are about the same cost per pound of effective chlorine.

Likewise, to compare effective cost between trichlor and dichlor is, I think, (almost as) easy.

For example, assume$3.00 per pound of 56% dichlor versus $3.33 per pound of 94% trichlor (84% effective chlorine):

FIRST CALCULATION: 56% dichlor at $3.00/pound x 100/56 = $5.36/pound effective chlorine

SECOND CALCULATION: 94% trichlor at $3.33/pound x 100/84 = $3.96/pound effective chlorine

COMPARISON: The trichlor is vastly cheaper than the dichlor in this example.

Assuming the calculations above are using the correct equations, what I'd like to compare is the liquid versus the powders. But I can no longer simply compare percentages.

Q: What is the equation to compare effective chlorine prices for liquid vs powdered chlorine?