If combined adjusted gross income is above $15,000 per month, which is the highest amount of income considered in the table of monthly basic child support obligations set forth in subsection (a) of this section, the basic child support obligation shall not be less than it would be based on a combined adjusted gross income of $15,000. The court may also compute the basic child support obligation for combined adjusted gross incomes above $15,000 by the following:
(1) One child -- $1,338 + 0.088 x combined adjusted gross income above $15,000 per month;
(2) Two children -- $1,934 + 0.129 x combined adjusted gross income above $15,000 per month;
(3) Three children -- $2,276 + 0.153 x combined adjusted gross income above $15,000 per month;
(4) Four children -- $2,515 + 0.169 x combined adjusted gross income above $15,000 per month;
(5) Five children -- $2,726 + 0.183 x combined adjusted gross income above $15,000 per month; and
(6) Six children -- $2,917 + 0.196 x combined adjusted gross income above $15,000 per month.