The mass, specific heat capacity and the temperature of a solid are 1000 g, 21 cal/g-°C and 80° C respectively. The mass of the liquid and the calorimeter are 900 g and 200 g. Initially, both are at room temperature 20° C. Both calorimeter and the solid are made of same material. In the steady state, temperature of mixture is 40° C, then find the specific heat capacity of the unknown liquid.