50% of 1,678.89 = 839.445 10% = 167.889 5% = 83.9445 1% = 16.7889 .5% = 8.39445 Therefore 66% = 1108.0674 and 7.5% = 125.91675 So the two added together is: 1233.98415 To get the percentages simply do the following 50% = divide by two 10% = divide 50% by five OR divide the original number by 10 5% = divide 10% by two or divide 50% by 10 1% = divide 5% by 5 or divide original by 100 .5% = divide 1% by two