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Contact & corrections

Report a calculation issue with enough detail to reproduce it.

Email: duomibiz@gmail.com

What to include in a correction

Record the page address, the input numbers, the output you saw and the result you expected. Use synthetic details instead of customer names, addresses or financial records.

Prepare a local feedback note

This form downloads a note to your device. It does not send a message, open a support ticket or upload your entries.