Population Genetics MCAT Practice Question

A population genetics researcher is studying cystic fibrosis carrier frequencies in an isolated Ashkenazi Jewish community of 500 individuals. The current frequency of the ΔF508 mutation (disease allele) is 0.4, while the normal allele frequency is 0.6. The population has remained stable for multiple generations with no new mutations, selection pressure, or immigration. A major immigration event occurs when 100 individuals from a Mediterranean population (where the ΔF508 mutation frequency is 0.1) relocate permanently to the community and integrate into the reproductive population. Assuming random mating, no selection, and one generation has passed, which of the following best predicts the new frequency of the ΔF508 mutation?