The Isotope Has a Half-Life of 5,715 Years

Multiple Choice

The isotope has a half-life of 5,715 years. After 20,000 years, a sample of the isotope is reduced 0.1 grams. What was the initial size of the sample (in grams) ? How large was the sample after the first 2,000 years? Round your answers to four decimal places.

A) 0.6786, 0.5324
B) 0.5655, 0.4437
C) 0.9048, 0.7099
D) 1.4703, 1.1536
E) 1.1310, 0.8874