Final answer:
The original loan amount was $116.67.
Step-by-step explanation:
To calculate the original loan amount, we can use the formula for simple interest:
Interest = Principal * Rate * Time
Given that the interest rate is 4% and the interest paid is $28, we can set up an equation:
$28 = Principal * 0.04 * 6 months
Solving for the principal, we have:
Principal = $28 / (0.04 * 6)
Principal = $116.67
Therefore, the original loan amount was $116.67.