Answer
$$3\times 10^{14}$$
Work Step by Step
In order to solve this problem, we follow order of operations. (Recall, we use the abbreviation PEDMAS to indicate the correct order.) Since this is only multiplication, we can do it in any order to find:
$$ \left(1.2\cdot \:10^8\right)\left(2.5\cdot \:10^6\right)\\ 10^{14}\cdot \:3\\ 3\times 10^{14}$$
