Tilly will make 100 x $10 = $<<100*10=1000>>1000 in total

She has spent $1000 - $300 = $<<1000-300=700>>700 on 100 bags

Each bag cost Tilly $700 / 100 = $<<700/100=7>>7

# Answer

7
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Tilly needs to sell 100 bags at $10 per bag to make $300 in profit. How much did she buy each bag for?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
7
Tilly needs to sell 100 bags at $10 per bag to make $300 in profit. How much did she buy each bag for?
train