7.5%
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15.5 percent = 155/1000 = 31/200
10% = 8.8, 5% = half of that, add them together: 13.2
10% is 38.4; 5%, ie half of that, is 19.2 so add those up and you get 15%...
Ten percent of this number is 2450, and half of that is 1225, and so adding these two numbers will give you fifteen percent, which in this case is 3675.
15% = 10% + 5%; 10% of 19 = 1.9 and 5% is half of that so 15% = 1.9 + 0.95 ie 2.85