Suppose that a certain fortunate person has a net worth of 7

Suppose that a certain fortunate person has a net worth of $75.0 billion ($7.50×1010). If her stock has a good year and gains $3.20 billion (3.20×109) in value, what is her new net worth? Express your answer to three digits.

Solution

Initial networth =75 * 10^(10)$

Gain in stock this year =3.20 * 10^(9) $

Now his new networth = (7.5 +3.20)* 10 ^9 $

=7.820*10 ^(10) $

Thank you