A solid of mass $300 \mathrm{g}$ is heated to a temperature $140 °\mathrm{C}$and then put in a calorimeter containing $200 \mathrm{g}$ of kerosene oil at $10 °\mathrm{C}$. If the mass of the calorimeter is $450 \mathrm{g}$ what is the final temperature of the mixture? Specific heat of solid$=0.12 \raisebox{1ex}{$\mathrm{cal}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{g} °\mathrm{C}$}\right.$. Specific heat of kerosene oil$=0.50 \raisebox{1ex}{$\mathrm{cal}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{g} °\mathrm{C}$}\right.$.