Bettina Amman is a sales consultant. She travels all over the country selling her company’s products. Her total monthly expenses for June, July, and August were $4,356.01, $9,011.20, and $8,780.00. What was her average monthly expenditure?

a

$7,382.40

b

$22,147.21

c

$8,090.25

d

$6,565.00