Question 1210274
<pre>

{{{system(S+B+C=100000, 
B=C+40000,0.0475C+0.055B+0.067S=5590)}}}

Solve the system and get

B=$60000, C = $20000, and S=$20000.

Here's an online solver to solve it for you so you don't have to do anything: 

https://www.emathhelp.net/calculators/algebra-2/system-of-equations-solver/

Edwin</pre>