Questions: On the following checking account record, enter the figures and add or subtract them to keep the running total correct.

Solution Steps

To solve this problem, we need to simulate a checking account record by iterating through a list of transactions. Each transaction will either add to or subtract from the current balance. We will maintain a running total that updates with each transaction.

Let the initial balance be \( B_0 = 0 \).

We have the following transactions:

• Deposit: \( +100 \)
• Withdrawal: \( -20 \)
• Deposit: \( +50 \)
• Withdrawal: \( -10 \)
• Withdrawal: \( -30 \)

We will calculate the running total after each transaction:

1. After the first transaction: \[ B_1 = B_0 + 100 = 0 + 100 = 100 \]
2. After the second transaction: \[ B_2 = B_1 - 20 = 100 - 20 = 80 \]
3. After the third transaction: \[ B_3 = B_2 + 50 = 80 + 50 = 130 \]
4. After the fourth transaction: \[ B_4 = B_3 - 10 = 130 - 10 = 120 \]
5. After the fifth transaction: \[ B_5 = B_4 - 30 = 120 - 30 = 90 \]

Final Answer