Question 276836
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Let *[tex \Large x] represent the amount invested in Bond B.  Then the amount invested in Bond A was *[tex \Large 20000\ -\ x].


The amount of interest earned on Bond A:  *[tex \Large 0.06(20000\ -\ x)]


The amount of interest earned on Bond B:  *[tex \Large 0.07x]


The sum of these two interest amounts was $1260, so:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 0.06(20000\ -\ x)\ +\ 0.07x\ =\ 1260]


Just solve for *[tex \Large x]


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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