Answer:
The correct answer is the account will reach zero within 4 months.
Explanation:
To make a correct table and find out when the 2800 in Lena's account will reach zero, you must subtract 700 from the total for each month.
The table would be formed as follows:
TOTAL 2800
MONTH 1: 2100
MONTH 2: 1400
MONTH 3: 700
MONTH 4: 0