A new asteroid has been discovered that entered the solar system on a high speed trajectory. A probe is launched to collect a sample of the asteroid. Once back on earth, the ratio between 40K and 40Ar is measured. Based on this ratio, 6.25% of the original 40K is still in the asteroid sample. According to the K-Ar data, how old is this asteroid? Remember, there are 1.3 billion years per half life for this method. Your answer should be in billions of years. You just need to enter the number such as 7.8 or 1.3