d
(D)  \({\text{20}}{\text{.2}} = \frac{{{\text{20}}{{\text{x}}_{\text{1}}} + 22{x_2}}}{{{x_1} + {x_2}}}\)

\(20.2{x_1} + 20.2{x_2} = 20{x_1} + 22{x_2}\,\,\,\, \Rightarrow \,\,\,\,\,0.2{x_1} = 1.8\,{x_2}\)

\(\frac{{{x_1}}}{{{x_2}}} = \frac{{1.8}}{{0.2}} = \frac{9}{1}\) સંલગ્ન

\({{\text{x}}_{\text{1}}}\%  = \frac{9}{{10}} \times 100 = 90\% \) હલકા સંસ્થાનીક 

\({{\text{x}}_{\text{2}}}{\text{% }}\, = \frac{1}{{10}} \times 100 = 10\%  = \) ભારે સંસ્થાનીક