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Reader saves
Effective price per book
Estimated amount you keep
Pricing is positioning too: a bigger discount is not automatically better. This shows the trade-off; it doesn’t know how price-sensitive your readers are.
Show me the boring maths
Bundle price = books × usual price × (1 − discount). Estimated amount kept = bundle price × rate entered.
Why this way?
The bundle calculation is intentionally platform-neutral: total normal value × (1 − discount). The optional “amount you keep” applies only the percentage rate you enter, so it is a rough commercial estimate rather than a store-specific royalty calculation. Fixed fees, delivery costs, VAT and retailer price rules are not invented for you.