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Marie is saving up for a week's vacation in Cuba. At the end of the month, she deposits $150 in her account, which contained $1200 at the start. we are interested in the amount saved and the umber of months sgone by.

a) What is the rate of change in this situation, and what does ot represent?

b) If the rate of change were to be increased in this situation, what effect would it have on Marie's savings?

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