Estimate the Product Without a Calculator $\left( 3 \times 10 ^ { 16 } \right) \left( 3 \times 10 ^ { 20 } \right)$

Multiple Choice

Estimate the product without a calculator. $\left( 3 \times 10 ^ { 16 } \right) \left( 3 \times 10 ^ { 20 } \right)$

A) $9 \times 10 ^ { 50 }$
B) $9 \times 10 ^ { 36 }$
C) $6 \times 10 ^ { 36 }$
D) $6 \times 10 ^ { 320 }$
E) $9 \times 10 ^ { 320 }$