Examples of using Mathematical Formula instead of bands.

Mathematical Formula would be an excellent replacement for any sort of tiers or levels so as to avoid wasting time re-negotiating the levels.

Potential Examples:

ATO Income Tax Rates: https://www.ato.gov.au/rates/individual-income-tax-rates/
eBay Listing Fees: http://sellercentre.ebay.com.au/selling-fees/quick-view