Potassium-40 Decays to Argon-40 with a Half-Life of 1

Potassium-40 decays to argon-40 with a half-life of 1.27 × 10⁹ yr. The age of a mineral sample that has a mass ratio of ⁴⁰Ar to ⁴⁰K of 0.330 is ________ yr.

A) 3.85 × 10⁹
B) 1.77 × 10⁹
C) 2.55 × 10⁹
D) 3.62 × 10⁸
E) 5.23 × 10⁸