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If you want to reach her goal of buying a new bike, Marsha will need to save $10 each week. This means she needs to save $10 every week in order to eventually buy the bike.
If she wants to reach her goal of buying a new bike each week, Marsha will need to save $10. This suggests that Marsha wants to buy a new bike every week, which would require a significant amount of money.
To reach her goal of buying a new bike, each week Marsha will need to save $10. This could imply that Marsha needs to save a specific amount each week in order to eventually buy the bike.