Maradee works at Cox's Jewelers for $7.50 per hour with time-and-a-half for all hours over 40 in a week. Thus, her weekly salary is given by s(h) - 11.25h + 300
where h is the number of overtime hours and S(h) is her weekly salary.

(a) Find S(4.5). (Round your answer to two decimal places)

(b) One week, Maradee worked 45 hours. Find her salary for that week