Answer
P(neither drives a car nor takes public transportation to work) $=0.085$
Work Step by Step
The event "a worker neither drives a car nor takes public transportation to work" is the complement of "a worker primarily drives a car or takes public transportation to work".
According to 39.a, P(primarily drives a car or takes public transportation to work) = 0.915. So:
P(neither drives a car nor takes public transportation to work) =
1 - P(primarily drives a car or takes public transportation to work) =
$1-0.915=0.085$
