1) $(2.4 \times 10^{3})\div (8 \times 10^{-2})=?$ A) $(3 \times 10^{-5})$ B) $(3 \times 10^{4})$ C) $(3 \times 10^{5})$ D) 30 Answer: Option BExplanation:$=(2.4 \times 10^{3})\div (8 \times 10^{-2})$ $=\frac{24 \times 10^{2}}{8 \times 10^{-2}}$ $=(3\times 10^{4})$