Posted by Carol on Sunday, June 24, 2007 at 6:16pm.
Bob invested $30,000, part at 10% and part at 1%. If the total interest at the end of the year is $1,560, how much did he invest at 10%?
Let x be the amount invested at 10%. Then, 30,000x is invested at 1%
0.1 x + 0.01 (30,000  x) = 1560
Solve that algebraic equation for x.
First step:
0.09 x = 1560  300 = 1260
x = ?

Math Help Please  Bob, Tuesday, December 16, 2014 at 11:46am
14000
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