Problema Solution
A plumber charges $30 for a house call and $20 per 1/2 hour of work.How much will the plumber charge for 4/1/2
Answer provided by our tutors
we need to find how much will the plumber charge for 4 1/2 = 9/2 hours:
30 + 20*((9/2)/(1/2)) = 30 + 20*9 = 30 + 180 = $210.