Am I right to refuse?

We have a neighbor an old lady asking me to wash her clothes using only one soap and will pay $4.00 and she wants my own water and electricity in washing machine in my house to wash her clothes. I refused because electricity is expendive water too and then her pay is only $4.00 in my country it should be at least $10.00 I live in Asia. So I said its not profitable for me because when I wash her clothes I will be using my own electricity and she's very cheapskate to use only one soap.
Am I right to refuse?
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