We will have the following:
First, we determine the monthly interest rate:
[tex]\frac{0.086}{12}=\frac{43}{6000}\approx7.2\ast10^{-3}[/tex]So, the monthly interest will be 43/600, so:
[tex]A=47000(1+(\frac{43}{6000})(6))\Rightarrow A=49021[/tex]So, he will have to pay back $49 021.