SOLUTION: mr bean invested a total of birr 10,000 in three different saving account the account paid simple interest at an annual rate of 8%,9% and 7.5% total interest earned for the year wa

Question 935747: mr bean invested a total of birr 10,000 in three different saving account the account paid simple interest at an annual rate of 8%,9% and 7.5% total interest earned for the year was birr 814 the amount in the 9% account was twice the amount invested in 7.5% account how did bean invested in each account
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = amount invested at 8%
y = amount invested at 9%
z = amount invested at 7.5%
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x + y + z = 10000
0.08x + 0.09y + 0.075z = 814
y = 2z
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put the system of linear equations into standard form
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x + y + z = 10000
0.08x + 0.09y + 0.075z = 814
y - 2z = 0
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = amount invested at 8% = 7200.00
y = amount invested at 9% = 1866.67
z = amount invested at 7.5% = 933.33
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