Final answer:
The additional amount of interest paid on the 30-year mortgage is $147.
Step-by-step explanation:
To find the additional amount of interest paid on the 30-year mortgage, we need to subtract the total payment made on the 15-year mortgage from the total payment made on the 30-year mortgage. The additional amount of interest paid on the 30-year mortgage is $752 - $605 = $147. Therefore, none of the given options (A, B, C, or D) represent the correct answer.