Rock and Brock are twins, but are very different. One day, their grandpa offers them a plan--for ten straight weeks he will give them each one dollar. But there is a catch! For each dollar they save, he will match it. If the...

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Rock and Brock are twins, but are very different. One day, their grandpa offers them a plan--for ten straight weeks he will give them each one dollar. But there is a catch! For each dollar they save, he will match it. If they spend it, they get nothing.

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