Calculate the concentration of each of the following solutions in mass percent. So lost

9.95g C2H6O in 69.1g H2O
118 KCl in 628g H2O
30.3 Mg KNO3 in 2.24g H20

Please help. I’m so lost on this question. I thought it would be for example..
9.95/(9.95+69.1) but that was wrong. Please, please help.