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A saving bond offers interest at a rate of 6

Economics

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A saving bond offers interest at a rate of 6.6%, compounded semi-annually. Suppose that a $500 bond is purchased.

a) Describe how the shape of the graph of this function would change if A bonus of 1% of the principal were added after 3 years has passed
b) Describe how the shape of the graph of this function would change if The size of the initial investment were doubled.

please write down the solving process!! it will really help me with my understanding!