If $86840.00 $LaTeX: \displaystyle dollars is invested at 4.4% simple interest for 13 years, how much interest is earned and what is the new account balance? </p>$

Using $LaTeX: \displaystyle I = P\cdot r \cdot t = (86840)(0.044)(13) = 49672.48$ . The account balance is $LaTeX: \displaystyle P + I = 86840 + 49672.48000000001 = 136512.48$