Solve the following and express the answer in scientific notation: (5.4 x 10^4) x (4.5 x 10^8)

Question

A. 2.4 x 10^10
B. 24 x 10^11
C. 24 x 10^12
D. 2.4 x 10^3

I say D

Answer 1

2.43 * 10^13 is the correct answer