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Problem 10 - Simple and Compound Interest Find the following effective rates of interest: a) Under simple interest rate of 4%. The effective rate of interest in the 9 th year is ig = b) Under simple interest rate of 4%. The effective rate of interest in the 13 th year is ia = %3D c) Under compound interest rate of 4%. The effective rate of interest in the 9 th year is i, d) Under compound interest rate of 4%. The effective rate of interest in the 13 th year is ij3 =