If 200.4g of water is mixed with 101.42g of salt the mass of the final solution would be reported as

301.8 g

Explanation:

We prepare a solution with 200.4 g of water (solvent) and 101.42 g of salt (solute). The mass of the solution is equal to the sum of the mass of the solvent and the mass of the solute.

m (solution) = m (solute) + m (solvent)

m (solution) = 200.4 g + 101.42 g

m (solution) = 301.8 g (we round-off to one decimal according to the significant figures rules)