Answer:
Option b. #21,319.20
Explanation:
Bob's average annual salary over the last 35 years = $50,760
His annual social security = 42% of his average annual salary
42% × 50,760
to calculate 42% of 50,760, we have to first convert 42% to fraction
× 50,760
= 0.42 × 50,760
= $21,319.20
Option b. #21,319.20