Answer:
a. $7,382.40
Step-by-step explanation:
With regards to the above,
Bettina Amman 's average monthly expenditure calculation is shown below;
= Total monthly expenses / Number of months
= $4,356.01 + $9,011.20 + $8,780 / 3
= $7,382.40
Therefore, Bettina Amman's average monthly expenditure is $7,382.40