Please help me understand this question (question in description)

Question

A DVD player can be purchased for no money down and 24 equal monthly payments of $18. The interest charged is 11.5% compounded monthly. Determine the equivalent cash price of the DVD player.

So the question is an example question, and it was already solved.

The example did it as PV=18[1-(1+0.115/12)^-24]/(0.115/12) and the PV is $384.28

My question is, how did they solve it? I tried calculating it and I got a different answer.

Answer 1

PV=18[1-(1+0.115/12)^-24]/(0.115/12)

PV = 18[1 - (1 + 0.0095833)^-24] / 0.0095833

PV = 18[1 - (0.795404166)] / 0.0095833

PV = 18[0.204595833] / 0.0095833

PV = 3.682724995 / 0.0095833

PV = 384.285684