The mass percent of salt and sand would be 57.07% and 42.93% respectively.
The mass percent can be calculated as:
Total mass of all the components = 8.35 + 6.28
= 14.63 tons
Mass percent of salt = 8.35/14.63 x 100
= 57.07 %
Mass percent of sand = 6.28/14.63 x 100
= 42.93%
More on calculating mass percent can be found here: https://brainly.com/question/5840377