1,146.74
The interest is $1046.74 and the principal is $100.
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If the 3% is "simple" interest, then the $100 earns an extra $18 in 6 years. If the interest is compounded yearly, then it earns $19.41 extra. If the interest is compounded weekly, then it earns $19.72 extra.
161.35
187.32
in 8 years it wll be 107.179
$100 (1.08)15 = $317.22 (rounded)