Missing sales revenue prevents gross profit calculation

Steps:

• Identify formula: Gross profit = Sales revenue - Cost of goods sold (COGS).
• Calculate COGS: Opening inventory (0, first year) + Purchases (86) + Carriage inwards (12) - Returns outwards (2) - Returns inwards (10, reduces sales but not COGS directly) - Closing inventory (15) = 71.
• Note carriage outwards (15) is a selling expense, not part of COGS.
• Recognize sales revenue is absent, making gross profit impossible to compute.

Why the correct option is correct:

• Not enough information; no sales figure provided to subtract COGS from.

Why the others are wrong:

• A, B, C, D all assume a sales value not given in the data.

Final answer: Not enough information.