Mason Inc. has only two retail and two wholesale customers. Information relating to each customer for $2020$ follows:

$($Click the icon to view the data.$)$

Requirement

Calculate customer$-$level operating income.

Begin by calculating each customer's gross margin. Then calculate the operating income for each customer. $($Use parentheses or a minus sign to enter a negative gross margin or a customer$-$level operating loss. Abbreviations used: cust $=$ customer; oper. $=$ operating.$)$