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P = (Po*r*t)/(1-(1+r)^-t).
Po = $20,300.
r = 0.0975/12 = 0.008125/mo.
t = 4yrs. * 12mo./yr. = 48 mo.
P = (20,300*0.008125*48)/(1-1.008125^-48).
P = 7917/(1-1.008125^(-48)),
P = 7917/0.32187535 = $24,596.48.
M.P. = P/48. = 24,596.48/48 = $512.43.