Final answer:
The concentration of sugar in the syrup is 20%.
Step-by-step explanation:
To calculate the concentration of sugar in the syrup, we need to determine the mass of sugar and the mass of the solution. In this case, 60 g of sugar is dissolved in 300 g of water. The concentration of sugar can be calculated using the formula: concentration = mass of solute / mass of solution. Therefore, the concentration of sugar in the syrup is 20%.