SOLUTION: calvin invested $7500 for one year, part at 12% annual interest and the rest at 10% annual interest. His total for the year was $890. How much money did he invested at 12%?

Question 232133: calvin invested $7500 for one year, part at 12% annual interest and the rest at 10% annual interest. His total for the year was $890. How much money did he invested at 12%?
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Let x = the amount invested at 12% per annum, then ($7500-x) would be the amount invested at 10% per annum.
The interest, whose sum is $890, earned on these two amounts can be expressed algebraically as:
Simplify and solve for x.
Combine like-terms on the left.
Subtracr 750 from both sides.
Divide both sides by 0.02

The amount invested at 12% is $7,000.00
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