Sarafina and Katie have between $105 and $420 dollars to spend on jewelry for Christmas presents for their friends. If they buy 7 bracelets at $3.25 each and 8 necklaces at $11.75 each, how many pairs of earrings can they buy if they cost $6.15 each?

Set up the compound inequality and solve. YOU MUST SHOW YOUR STEPS TO RECEIVE FULL CREDIT.