fnding out stop loss

#1
I am small investor trading small amounts and my time span is 1 to 3 months and profit margin is 7 to 10%.

what is the rational.objective method (some sort of formula) of finding out the stop loss as well as trailing stop loss. I am well versed in excel and if it is in formulas even with its limitations I can prepare a programme to alert me on reaching stop loss
 

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