Condition number - eigenvalues

I have the following matrix

begin{bmatrix}
15.52 & 0.00 & -14.52 \
-11.05 & 1.00 & 11.05 \
-0.01 & 0.00 & 0.01
end{bmatrix}

I am supposed to calculate the condition number as the ratio between its maximum and minimum eigenvalue. My result is 24116.0899 using $ k(A)=Bigvertfrac{lambda _{max}(A)}{lambda _{min}(A)} Bigvert$ But the official result is $5.86 cdot 10^{4}$.

Can somebody help me?

Thank you