Store a: $25 for a 45 minute lesson store b: $30 for a 1 hour lesson store c: $45 for a 1.5 hour lesson store d: $80 for three 1 hour lessons julie wants to purchase swim lessons for her son. there are four different stores that offer swim lessons. based on the lowest cost per minute, which store has the best deal? a) store a b) store b c) store c d) store d