If $45820.00 $LaTeX: \displaystyle dollars is invested at 4.2% simple interest for 23 years, how much interest is earned and what is the new account balance? </p>$

Using $LaTeX: \displaystyle I = P\cdot r \cdot t = (45820)(0.042)(23) = 44262.12$ . The account balance is $LaTeX: \displaystyle P + I = 45820 + 44262.12 = 90082.12$