Final answer:
To find the total balance on the next billing date, calculate the interest charged on the unpaid balance and add it to the unpaid balance. The total balance on the next billing date will be $1,231.40.
Step-by-step explanation:
To find the total balance on the next billing date, we need to calculate the interest charged on the unpaid balance and add it to the unpaid balance. First, calculate the interest charged:
Interest = Monthly interest rate x Average daily balance
Interest = 1.8% x $1,500 = $27
Now, add the interest charged to the unpaid balance: $1,200 + $27 = $1,227
So, the total balance on the next billing date will be $1,227. Therefore, the correct answer is b) $1,231.40.