How to ask my cheapskate boss for a pay raise?

For the past three years I have worked at a sleep away camp. I have made a total of $2,000 for 6 months total work.

This summer I will be working a total of 4 months for a paycheque a little over $3,000. I find this completely unreasonable for the amount of work I am doing, but I run the risk of not being welcomed back if I ask for a raise. Any advice?

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