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Plzzz tell me the answer and working out

Plzzz tell me the answer and working out-example-1
User Bach
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1. we know she needs 3 packs of biscuits
2. Shop A you only need to pay for 2 packs
3. Shop B you only need to pay for 2 packs
4. Shop C you need to pay for all three
5. so we know C is out of the option.

1.90 * 2
so shop A and B will cost the least
User Marcellsimon
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