Well, say you want to buy something from someone for 1g (1000s).

If you were buying and they wanted you to pay 1g **before tax** then they would receive 700s (1g - 30% or 300s)

If you were buying and they wanted you to pay 1g **after tax** then they would receive 1g, and you would have to pay 1.43g (1430s or 1430000 bronze/normal Mushcoins) (approximately).

Using Jonno’s formula, you can see why this happens, since 10/7 (or 100/70) is equal to approximately 1.43.

**Basically, to calculate how much you have to pay if the person you’re buying from wants a certain amount after tax, multiply what they’re asking for by 1.43x and you’ll end up with roughly that amount.**

This also works in reverse, with the rolls swapped. Say you’re selling something for 1g. You’d receive 700s if they paid exactly 1g, and approximately 1g if they paid 1.4g