[SPLIT, MOVED] invested $ at 3%, twice $ at 9%, got $315  TOPIC_SOLVED

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[SPLIT, MOVED] invested $ at 3%, twice $ at 9%, got $315

Postby JP tang on Thu Jan 12, 2012 1:13 pm

A man invested a certain amount of money at 3% and twice as much at 9%, giving the annual income of 315. How much did he invest in each rate?
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Re: [SPLIT, MOVED] invested $ at 3%, twice $ at 9%, got $315  TOPIC_SOLVED

Postby FWT on Thu Jan 12, 2012 4:24 pm

JP tang wrote:A man invested a certain amount of money at 3% and twice as much at 9%, giving the annual income of 315. How much did he invest in each rate?

They show how to do this on this page.

Code: Select all
table:
      | amt | rate | total
--------------------------
  $   |  x  | 0.03 | 0.03x
twice | 2x  | 0.09 | 0.18x
total | 3x  |  NA  |  315
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