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A bank started a new savings account on October 10,2011, using the accumulation function a(t) = mt^2 + n, where t is measured in years. An investment of 550 made on October 10,2011 is worth 726 on October 10,2015.
a) How much interest will be earned durinh the 7th year on an investment of 1200 made on October 10,2011?
b) Find the effective rate of interest durinh the fourth year from October 10, 2011.
c) Find the effective rate of discount during the third year October 10, 2011.
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