By the first sentence, you’ve already done more problem solving than an LLM-brained person.

Not folding 3-ply is asking for added expenses in the form of water and soap though... Push right through em

Feel like bidet's must be accounted for if we gonna start the math justifications

It hurts my brain to do it that way.

300 sheets for 1.2 is a nice division by .6: 500 sheets for $2. So now all we gotta do is multiply by .7 to get 350 sheets for 1.40.

Considering the fold, we are at 330 effective sheets for 1.40. 350 > 330, get the 3 ply (lol).

This is a little bit funky obviously and just works because of seeing a divisor. If not for that I would have tried once each way to get cost per full effective sheet or cost per half effective sheet to see which one has nicer numbers.

... Or just open the calculator app.

That's needlessly complicated.

If you're folding the 2-ply, you only get 165 wipes. So divide 70 by 165 to get 0.42 cents a wipe

Now the 3-ply is 300 wipes, so divide 120 by 300 to get 0.40 cents a wipe

The cheap stuff is more expensive.

But we need to take into account that the folded 2 ply becomes an effective 4 ply, so you're getting more ply per penny