A calorimeter of heat capacity $170\raisebox{1ex}{$ \mathrm{joule}$}\!\left/ \!\raisebox{-1ex}{$g°\mathrm{C}$}\right.$ contains $250 \mathrm{g}$ of liquid at $40 °\mathrm{C}$. A piece of metal of mass $300 \mathrm{g}$ is heated up to $200 °\mathrm{C}$ and put in the calorimeter. The final temperature of mixture is obtained $70 °\mathrm{C}$. If specific heat of metal is $0.42\raisebox{1ex}{$ \mathrm{joul}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{g} °\mathrm{C}$}\right.$, calculate the specific heat of the liquid.