answered question 7/14/2010 Thomas Charged $2,400 On His Credit Card To Buy Furniture. The Interest Rate Charged By The Credit Card Company Is 24.9%. How Much Will He Pay In Interest After One Month? Interest= (24.9/100) x 2400 24.9 x 24= 597.6 inerest = 597.6 total amount to be paid = 2400+597.6 = $2997.6