New answers tagged billing
I'd just follow what PayPal do, it's clearly enough differentiated with using red and green (obviously there's colour blind issues with these colours) and +/- but it leaves the prices in black:
An alternative is to have pricing levels e.g. single user, 2-10 users, 11-100 users with price breaks. This would give your users better understanding of what they are spending, would make accounting easier, etc. etc.
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