Below is the marginal willingness to pay of a consumer for organic apples.
$$
\begin{array}{cc}
\hline \begin{array}{c}
\text { Consumption Level } \\
\text { (apples per week, lbs.) }
\end{array} & \begin{array}{c}
\text { Marginal } \\
\text { Willingness to Pay }
\end{array} \\
\hline 0 & 5.00 \\
1 & 4.00 \\
2 & 3.20 \\
3 & 2.60 \\
4 & 2.20 \\
5 & 1.80 \\
6 & 1.50 \\
\hline
\end{array}
$$
a. What is this individual's total willingness to pay at a consumption level of 4 apples?
b. If the price of organic apples is $$\$ 2.40$$, how many apples would this person consume?