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OpenStudy (anonymous):
$5400 is invested. Part of it at 10% and part at 8%. For a certain year the yield is $492.00. How much was invested at each rate. Please Help.
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OpenStudy (anonymous):
A=P(1+RT)
OpenStudy (anonymous):
5400+492=PAt10(1+.01)+PAt8(1+.08)
OpenStudy (anonymous):
you also know 5400=PAt10+PAt8. You can solve for PAt8 and plug it into the first equation
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