Answer:
See explanation for answer.
Step-by-step explanation:
The entire amount of money you would make in a day would be "100 %" for a gear of how the money should be split "100%" could be "$20". If you are the manager and "$20" is made that day then "15%" of that profit should go to you and the other "5%" go to the employee( your sibling ) So you would make "$15" and your sibling would make "$5". Of course, a negotiation should be made but if you bought everything and set it all up you should be making more money than your sibling. I'm not quite sure if this is correct or even what you wanted but I hope it helps! ( This entire answer would of course change if the daily income from the lemonade stand changed. )
Have a lovely day!