$6\mathrm{.}2\mathrm{.}8$

$.$ A power company operates one of its boilers on natural gas and another on oil. The analyses of the fuels show $96\%C{H}_4,2\%C_2{H}_2,$ and $2\%C{O}_2$ for the natural gas and $C_n{H}_{1\mathrm{.}8n}$ for the oil. The flue gases from both groups enter the same stack, and an Orsat analysis of this combined flue gas shows $10\mathrm{.}0\%C{O}_2,0\mathrm{.}63\%CO,$ and $4\mathrm{.}55\%O_2.$ What percentage of the total carbon burned comes from the oil?