UgICOU An Analysis of the rock shows that the relative num- ber of Sr78 and Rb 87 (t; 2 = 4.7 x 1010 year) atoms is 0.05. What is the age of the rock? Assume all the Srs have been formed from RDS only. (llog1.05) = 0.021, log 0.85 = 0.07, log 0.05 = 1.30) A 7.62 x10° vear B 1.43 x 10° year C 3.28 x 10 year D 4.32 x 10 year