Mary and Mark both have

$

$400$

of debt on their credit cards. The Annual Percentage Rate on the card is $20\%.$ Each month, they are charged an annual interest on their cards' outstanding balances. So when Mary and Mark make payments, part of each payment goes to paying interest and part goes to the principal$\mathrm{.}1$ Mary and Mark promise themselves they will not charge any more purchases until they have completely paid off their credit card balances.

Determine each person$$s interest, payment, and new balance, for the second month. $($Mark decides to pay the additional

$

$15$

in the second month also.$)$

Mary:

Interest:

$

Payment:

New Balance:

Mark:

Interest:

Payment:

New balance: