Çözüldü Mixture and Percentage Problem

When 100 grams of water are added to half a kilogram of saltwater that is 30% salt by weight, what is the percentage of salt in the mixture?

A) 22
B) 24
C) 25
D) 26
E) 27

https://matematiknotu.com/wp-content/uploads/2020/02/Karisim-Problemleri-Temel-Test-1.pdf
[The last question (Turkish), Answers at the bottom of the last page]

500·(30 / 100) grams / [ (500 + 100) grams ] = 150 / 600 = 1 / 4 = 0.25 ===> 25%.