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