Final answer:
You would call the IncreaseItemQty function with addStock as an argument and assign the result to mugInfo using the line: mugInfo = IncreaseItemQty(addStock);.
Step-by-step explanation:
To call a function named IncreaseItemQty and pass the variable addStock to it, as well as to assign the return value to mugInfo, you would write the following statement (assuming you're using a programming language like JavaScript):
mugInfo = IncreaseItemQty(addStock);
This line of code demonstrates a function call with a single parameter. After the IncreaseItemQty function executes, the return value is stored in the variable mugInfo, which can then be used elsewhere in your program.