This tool computes the amount to pay each month in order to discharge the current debt within a desired period, while more purchases are made and interest charges continue.

 

The dotted profiles demonstrate the effect of slightly increasing or reducing the level of repayment - try placing the mouse over each profile in turn and notice how the lower summary information switches to refer to that profile. In each case,  the total interest payable and the time to become debt free, is shown in the summary section.