Answer: 4; $1,012.50
Step-by-step explanation:
The formula to calculate the interest charged on a credit card balance is:
Interest = (Balance * APR) / 12
Where,
Balance = $1,000
APR = 15%
So,
Interest = ($1,000 * 15%) / 12 = $12.50
Therefore, after one month, the total balance on the credit card would be $1,000 + $12.50 = $1,012.50.