$12,000 is invested for 4 years at a simple interest rate of 1.5%. How much does the investment earn?
Mathematics
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Question
$12,000 is invested for 4 years at a simple interest rate of 1.5%. How much does the investment earn?
2 Answer

1. User Answers zoeharris14
You didn't say if the 1.5% was per month, per 6 months, or per year. So, I'm just gonna put it all.
1.5% per month: The interest is $8640 and the amount is $20640.
1.5% per 6 months: The interest is $1440 and the amount is $13440.
1.5% per year: The interest is $720 and the amount is $12720. 
2. User Answers casltiel2
since 12% is 2/3 as much interest, 3/2 as much should be invested there.
Or, since the interest ratio is 2:3, the investment should be 3:2
So, 40% at 18% and 60% at 12%
.12 * 7200 = .18 * 4800 = 864
or, in the usual algebraic way,
.12x = .18(12000x)