Use the actual selected subtotal
At the dated displayed amounts, one Sunsweet pouch, one Brothers 12pack and one Bare pouch total$27.47in merchandise. The basket stores money as integer cents parsed from decimal strings. Prices are editable quote inputs, not a live connection to a merchant. The combined ledger is not a promise that all three items can be ordered together.
Allow an exact full merchandise credit
A$27.47merchandise-only credit against that one-each subtotal leaves$0.00net merchandise. A$27.48credit is rejected as one cent too large. The tool does not silently cap the excessive entry or create a negative total. These are arithmetic boundary examples, not real advertised coupons or claims that a seller accepts the adjustment.
Keep delivery charges separate
If shipping is$4.99and tax is$1.25with other charges explicitly zero, full merchandise credit still leaves$6.24in the limited estimate. Unknown charges stay unknown rather than becoming free. A real promotion could have different terms, so enter only the confirmed adjustment for the eligible order and keep merchant-specific shipping or tax conditions attached.
Check the small decimal cases
A user price of$0.10with quantity three gives$0.30; full$0.30credit is valid and$0.31is not. A user price of$47.99with quantity two gives$95.98; that exact credit is valid and$95.99is not. These test values are not observed fruit prices. Totals are formatted after cent calculations, avoiding a floating-point equality error at the credit boundary.
Reject unsupported entry forms
The form refuses prices with more than two decimal places, exponent notation, negatives or amounts above its stated maximum. Package quantities must be whole and bounded. The exact quote, actual item availability, promotion eligibility and final checkout still need merchant confirmation. The site cannot place orders, apply codes or reserve a currently unavailable box.
Apply a real credit only to its eligible merchant
A$5credit issued for one merchant cannot automatically reduce the combined three-source ledger. If it applies only to Sunsweet’s eligible merchandise, calculate that specific order under the actual terms. The full$27.47credit example is a boundary test, not an available promotion. Keep shipping and tax entered explicitly so a merchandise adjustment does not erase charges the seller still collects. An accurate mathematical result can still describe an unavailable deal if its discount premise was never verified.
Sources & scope
Checked November 4, 2026. Manufacturer and retailer references support the specific statements. Dated displayed prices are not final checkout quotes, performance rankings or performance testing. This shopping reference does not replace the exact product label or qualified individual advice. Current received labels and independent food-nutrition/content/commerce review remain pending.
Sunsweet: exact Amaz!n8oz pouch and linked nutrition image ↗
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