Solve the Problem $\$ 4.2 \times 10 ^ { 10 }$

Multiple Choice

Solve the problem. Express your answer in scientific notation, and round to one decimal place.
-In a state with a population of 7,000,000 people, the average citizen spends $6,000 on housing each year. What is the total spent on housing for the state?

A) $\$ 4.2 \times 10 ^ { 10 }$
B) $\$ 4.2 \times 10 ^ { 9 }$
C) $\$ 42 \times 10^{10}$
D) $\$ 42 \times 10 ^ { 11 }$