\(K(x,y) \approx K(x_0,y_0)+ \partial_xK(x_0,y_0)(x-x_0)+\partial_yK(x_0,y_0)(y-y_0)\)
\( K(x_0,y_0) = 189.2 \)
\( \partial_xK(x, y) = \frac{3}{10}-\frac{1600}{x^2} \) , \( \partial_xK(x_0, y_0) = 0.29 \)
\( \partial_yK(x, y) = \frac{3}{10}-\frac{1000}{y^2} \) , \( \partial_yK(x_0, y_0) = 0.275 \)
\(K(x,y) \approx 189.2 + 0.29 * ( 400*0.06) + 0.275 * ( 200*0.01 ) = 196.71 \)