Answer :
[tex]x-value\ of\ investments\\\\
40000+5\%x=71750\ \ \ |-40000\\\\
5\%x=71750-40000\\\\
5\%x=31750\ \ \ \ |\ Write\ 5\%\ as\ \frac{5}{100}=0,05\\\\
0,05x=31750\ \ \ |:0,05\\\\
x=635000\\\\total\ value\ of\ investements\ was\ 635000\ dollars.[/tex]
x=investments sold
Salary= 40,000 + .05x
71,750 = 40,000 + .05x
31,750 = .05x
635,000 = x
Salary= 40,000 + .05x
71,750 = 40,000 + .05x
31,750 = .05x
635,000 = x