Question 1144256
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Let "x" be the COMMON EQUAL value of each of the four investments.


Then the condition says that


    0.05x + 0.07x + 0.09x + 0.11x = 1440   dollars  (total annual interest).


Simplify and solve this equation


    0.32x                         = 1440

        x                         = {{{1440/0.32}}} = 4500 dollars.


The total amount invested is 4x = 4*4500 = 18000 dollars.
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Ignore the solution and the answer of the other tutor, &nbsp;since they are &nbsp;&nbsp;<U>W R O N G</U>.