If combined adjusted gross income is above fifteen thousand dollars 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 fifteen thousand dollars. The court may also compute the basic child support obligation for combined adjusted gross incomes above fifteen thousand dollars by the following:

(1) One child -- $1,338 + 0.088 x combined adjusted gross income above fifteen thousand dollars per month;

(2) Two children -- $1,934 + 0.129 x combined adjusted gross income above fifteen thousand dollars per month;

(3) Three children -- $2,276 + 0.153 x combined adjusted gross income above fifteen thousand dollars per month;

(4) Four children -- $2,515 + 0.169 x combined adjusted gross income above fifteen thousand dollars per month;

(5) Five children -- $2,726 + 0.183 x combined adjusted gross income above fifteen thousand dollars per month; and

(6) Six children -- $2,917 + 0.196 x combined adjusted gross income above fifteen thousand dollars per month.