Based on the expenses he incurred during the month, Marco most likely had a starting balance of a. $255
Marco had the following expenses:
His total expenses are therefore:
= 20 + 22 + 13 + 39 + 34 + 15 + 31
= $174
These expenses are the reason his account is at $81 so the starting balance must be:
= Closing balance + Expenses
= 81 + 174
= $255
In conclusion, the opening balance was $255.
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