Juan needs to spend $3 from his pocket to start the lemonade stand to earn money.
To start the lemonade stand, Juan needs to purchase materials before selling his product and earning money. For this he needs money. His mother agreed to give him $10 as a loan to start a lemonade stand. To purchase the required item, he made a list of items to buy:
Add all the supply item prices to know how much money he required.
So
Price of cups + price of Lemon + Price of sugar
=$2 + $8 + $3 = $13.
He needs $13 to start the lemonade stand.
But his mother give him $10 as a loan, now the required money is
$13-$10=$3.
Juan needs to invest $3 from his pocket to start the lemonade stand and earn money.
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