39.90 plus 7 percent sales tax = 42.69
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The sum you require is 15.89 X 1.06. Multiplying by "1.06" takes your original number, and adds 6% of the original number to it again.
100,000 + 20% = 120,000
sum=360
The sum of 3 plus 4 is 7.
SUM means plus 4+7=11