Final answer:
Janis made $1,237.50 before expenses.
Step-by-step explanation:
Janis can make 18 bead bracelets in 4 hours. To find out how many bracelets she can make in 1 hour, we divide 18 by 4, which gives us 4.5 bracelets per hour.
Janis worked for 10 hours over the weekend, so she made 4.5 bracelets per hour times 10 hours, which is 45 bracelets.
If each bracelet sold for $27.50, then Janis made 45 bracelets times $27.50, which is $1237.50 before expenses.