A 250.0g agricultural formulation consists of active ingredient A, inert filler B, and water. Initially, the formulation is 15.0% A by mass and 25.0% B by mass, with the remainder being water. After the container is left open, exactly 30.0g of water evaporates, while no A or B is lost. What is the new mass percent of active ingredient A in the formulation?
a) 18.8\%
b) 17.0\%
c) 15.0\%
d) 13.6\%