From 1970 to 1990, Sri Lanka's population grew by approximately 2.2 million persons every five years. The population in 1970 was 12.2 million people.What is the best formula for P, Sri Lanka's population (in millions) in terms of t, the number of years after 1970? O a. P 12.25t b. P= 12.2 + 2.2 t O c. P= 12.2 + 11.0 t O d. P= 12.2 + 0.44 t O e. P = 12.2 x 2.2 ()