Question 882523
can you please help me solve this word problem:
A mother wants to invest $7,000.00 for her son's future education. she invests a portion of the money in a bank certificate of deposit (CD account) which earns 4% and the remainder in a savings bond that earns 7%. If the total interest earned after one year is $420.00, how much money was invested in the CD account?
<pre>
Let amount invested in CD account be F
Then amount invested in bond = 7,000 – F
Interest earned on CD, plus interest earned on bond, equals total interest earned, OR
.04(F) + .07(7,000 – F) = 420
.04F + 490 - .07F = 420
.04F - .07F = 420 – 490 
- .03F = - 70
F, or amount invested in the “4% CD” = {{{(- 70)/- .03}}}, or ${{{highlight_green(highlight_green(2333.33))}}}
You can do a check!! 

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