Lynn and Michael have been offered jobs where they will be paid strictly on commissions. They expect to receive 4% commissions on all sales of Solar Panels they close. Lynn's goal is to earn a gross salary of $60,000 a year. Michael's goal is to earn a gross salary of $20,000 a year part-time. How much in Solar Panel sales would Lynn and Michael need in order to reach their targeted salaries? Show your work.