SOLUTION: Aubrey invested a sum of money at 3% annually, and a sum twice as great at 4% annually.if the total annual interest from both investments is P1650, find the amount she invested at

Question 1095212: Aubrey invested a sum of money at 3% annually, and a sum twice as great at 4% annually.if the total annual interest from both investments is P1650, find the amount she invested at each rate.
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
a sum of money: x
a sum twice as great: 2x
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0.03x + 0.04(2x) = 1650
0.03x + 0.08x = 1650
0.11x = 1650
x = 15000 this is the amount at 3%
and:
2x = 2(15000) = 30000 this is the amount at 4%
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