Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: Tilly will make 100 x $10 = $1000 in total. She has spent $1000 - $300 = $700 on 100 bags. Each bag cost Tilly $700 / 100 = $7.
 The question and answer:
user
Tilly needs to sell 100 bags at $10 per bag to make $300 in profit. How much did she buy each bag for?
The answer is 7
assistant