A law firm seeks to recruit top quality experienced lawyers. the total package offered is the sum of three separate components: a basic salary which 1.2 times the candidate's current salary together with an addintional $3000 for each year worked as a qualified lawyer and an extra $1000 for every year that they are over the age of 21. Work out a formula that could be used to calculate the total salary, S, offered to someone who is A years of age, has E years of relevant experienced and who is 30 years old with five years experienced and who currently earns $150.000.