In a container of negligible heat capacity $100\,\text{gm}$ of a liquid at $20°\text{C}$ is heated. Specific heat of the liquid varies with temperature given as $s = (100T + 500)\,\text{J/kg-°C}$, where $T$ is in $°\text{C}$. Find the amount of heat required to raise the temperature of the liquid to $40°\text{C}$.