March bill was \$400.00 for 25% to be paid of that. There is a recurring overpayment amount of \$85.00 so \$85.00 was to be withdrawn from the 25% of \$400.00 for a total of \$15.00.
\$400.00 x .25 = \$100.00
\$100.00 - \$85.00 = \$15.00
However, rather than doing that; the following was...