Please help me need help

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Ineed here’s a picture of the question

Megan is making bracelets to sell to earn money for the local animal shelter. it takes her 1/4 hour to pick out all the beads and 1/10 hour to string them.this week, she only has 5 1/4 hours to make bracelets. how many bracelets will megan be able to make?