120 x 8.5 = 1020 per year
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75
Interest = (Principal x Time X Rate)/100 so in this case interest = (1000 x 3 x 9)/100 = 2700/100 = 27
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.
29.86
Two and a half percent of 750 ie 2.5 x 7.5 which is 18.75