Solve a minimization problem

Hi, this could be a very simple problem, but I don't know how to do...
Let's say I have 3 sources of income:
Source 1 = $200
Source 2 = $700
Source 3 = $400
Now, I have something that I want to pay for using these income sources, let's say it's $800.
I want to take as small percentage as possible from each source to pay for those $800. So I have something like;
x1*200 + x2*700 + x3*400 = 800

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2019-10-3

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