Compute the Probability of an Event Using the Complement Rule $X$

Compute the Probability of an Event Using the Complement Rule
-A sample of 280 shoppers at a large suburban mall were asked two questions: (1) Did you see a television ad for the sale at department store X during the past 2 weeks? (2) Did you shop at department store X during the past 2 weeks? The responses to the questions are summarized in the table. What is the probability that a randomly selected shopper from the 280 questioned did not shop at department store $X$ ?
$\begin{array}{l|c|c} & \text { Shopped at X } & \text { Did Not Shop at X } \\\hline \text { Saw ad } & 140 & 30 \\\hline \text { Did not see ad } & 30 & 80\end{array}$

A) $0.393$
B) $0.107$
C) $0.286$
D) $0.607$