The amount save by Marcia in interest by consolidating the two balances is $133.92.
The total monthly payment for APR of 16% is calculated as follows;
Total monthly payments for 16% =$39.38x48 = $1890.24
Total monthly payments for 12% APR = $36.59*48 = $1756.32
A = $1890.24 - $1756.32
A = $133.92
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