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yvonne put $4,000 in a savings account. at the end of 3 years, the account had earned $960 in simple interest. (need with this question! ) a. how much does she have in her account at the end of 3 years? b. at what annual simple interest rate did the account grow? show your work. c. how many more dollars would she have in her account if the interest rate were 1% greater? show your work. (4 points)