Callback

Assupmtions:
1. Service is billed at $50.00/hour.
2. Net Profit on Service is 5%, i.e. the cost of labour & materials is $47.50/hour and net profit is $2.50/hour.

Hours Service Call Billing       Cost Net Profit Cumulative Net Profit

1    1 hr. Callback $ 0.00 $47.50 ($47.50) ($47.50)
2 1 hr. Paid $50.00 $47.50 $ 2.50 ($45.00)
3 1 hr. Paid    $50.00 $47.50    $ 2.50 ($42.50)
4 1 hr. Paid $50.00 $47.50 $ 2.50 ($40.00)
5 1 hr. Paid $50.00 $47.50 $ 2.50 ($37.50)
6 1 hr. Paid $50.00 $47.50 $ 2.50 ($35.00)
7 1 hr. Paid $50.00 $47.50 $ 2.50 ($32.50)
8 1 hr. Paid $50.00 $47.50 $ 2.50 ($30.00)
9 1 hr. Paid $50.00 $47.50 $ 2.50 ($27.50)
   10 1 hr. Paid $50.00 $47.50 $ 2.50 ($25.00)
   11    1 hr. Paid $50.00 $47.50 $ 2.50 ($22.50)
   12 1 hr. Paid $50.00 $47.50 $ 2.50 ($20.00)
13 1 hr. Paid $50.00 $47.50 $ 2.50 ($17.50)
14 1 hr. Paid $50.00 $47.50 $ 2.50 ($15.00)
   15 1 hr. Paid $50.00 $47.50 $ 2.50 ($12.50)
16 1 hr. Paid $50.00 $47.50 $ 2.50 ($10.00)
17 1 hr. Paid $50.00 $47.50 $ 2.50 ($ 7.50)
18 1 hr. Paid $50.00 $47.50 $ 2.50 ($ 5.00)
19 1 hr. Paid $50.00 $47.50 $ 2.50 ($ 2.50)
20 1 hr. Paid $50.00 $47.50 $ 2.50 ($ 0.00)


To make up for the loss created by a 1 hour unplanned, unpaid callback, the Serviceperson must work a total of

20 hours for nothing!