You can put this solution on YOUR website! D02 base 16 plus 226 base 16 then check the answer by converting both the problem and answer to base 10
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$ prefix = Hex (base 16)
$D02
$226
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$F28
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$D02 = 3330
$226 = 550
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$F28 = 3880
It all matches
I have a calculator that does Hex