Question 1204040
<pre>
ACCOUNT      %RATE       INVESTED         AMT. RETURNED
  A            2          4000            (0.02)(4000)
  B            7            b             0.07b
</pre>
5% profit on  invested amount  4000+b.

{{{highlight_green(0.05(4000+b)=(0.02)(4000)+0.07b)}}}---------solve for b.




--------------------------seriously misread problem------below here is wrong------

A and B, amounts invested in plans A and B

{{{system(A+B=4000,(0.02)A+(0.07)B=(0.05)(4000))}}}

A little simplifying,

{{{system(A+B=4000,2A+7B=20000)}}}

Question asked for B.

{{{system(2A+7B=20000,2A+2B=8000)}}}

E1-E2,...

{{{highlight()}}}