SOLUTION: John invested $30k in various stocks & bonds. He earned 6% on his bonds and 12% on his stocks. Total profits on both investments = $2460. How much of the $30k did he invest in bo

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Question 1107249: John invested $30k in various stocks & bonds. He earned 6% on his bonds
and 12% on his stocks. Total profits on both investments = $2460.
How much of the $30k did he invest in bonds???

Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
One single equation in one single unknown B = How much of the $30k did he invest in bonds

interest  +  interest      = total interest
on bonds     on stocks


0.06*B    + 0.12*(30000-B) = 2460.


Simplify and solve for B.


0.06*B + 3600 - 0.12*B = 2460

-0.06*B = 2460 - 3600 = -1140  ====>  B = %28-1140%29%2F%28-0.06%29 = 19000.


Answer.  $19000 was invested in bonds.