Insufficient information to calculate the exact discount Steps:

• List price of goods is $1000.
• Andy paid $700 after a 5% prompt payment discount.
• The 5% discount applies to an unspecified base amount (likely the net invoice after any trade discount).
• Without the base for the 5%, the prompt discount amount cannot be determined; total saving from list price is $300, but not an option.

Why C is correct:

• Not enough information; C may assume a different payment amount like $800 for total discount of$200, but given numbers do not support this.

Why the others are wrong:

• A: 5% of $800 =$40, but no $800 base given.
• B: 5% of $1800 =$90, arbitrary base.
• D: Approximate trade discount if cash base ~$737 (700/0.95), but 1000-737=$263, not $278.

Final answer: Not enough information.