200 g of saline contains 10 g of salt. What is the concentration of salt in the solution?

First, let’s find out what one percent of the total saline is equal to. To do this, we take the weight of the saline solution and divide it by 100, because 100 is the whole integer that the saline solution expresses:

200: 100 = 2 grams is 1 percent solution.

Now we divide the amount of salt that is contained in the solution by 1% of the weight of the solution, so we find out how much salt is in a given solution as a percentage:

10: 2 = 5% concentration of salt in the flask with the solution.

Answer: 5%.