=+Jane was surprised at the size of the bill and asked for some greater detail supporting the calculations. The Nerd Squad responded with the following explanations:

Cost of materials:

Purchase price of circuit board $45 Markup on purchase price to cover storage and handling 15 ____ Total materials charge $60 ____ ____ The labor charge per hour is detailed as follows:

2:00–3:00 P.M. $ 55 3:00–4:00 P.M. 45 4:00–5:00 P.M. 65 5:00–6:00 P.M. 90 _____ Total labor charge $255 _____ _____