REDUCTION IN WAITING TIME

P1

Lq =
W =
Wq =
If the arrival rate increases to 12 per hr., what would happen?

P2

ONE TELLER
Wq =
TWO TELLERS
Wq =
REDUCTION IN WAITING TIME =
ANNUAL INCREASE IN BANK REVENUES =
ANNUAL COST OF ADDITIONAL WINDOW =
BENEFIT FROM ADDING A SECOND WINDOW =

P3

a) CURRENT SITUATION
Lq =
W =
Wq =
TRUCKS REMAIN ___ MINUTES INSTEAD OF ___ MINUTES
OR ___MINUTES EXTRA AT A COST OF $____ PER MIN. = ________
IN LOST REVENUES.
b) USING TWO SCALES
Lq =
W =
Wq =
TRUCKS REMAIN ___ MINUTES INSTEAD OF ___ MINUTES
OR ___ MINUTES EXTRA AT A COST OF $_____ PER MIN. =
IN LOST REVENUES.
COST OF SECOND SCALE
BENEFIT FROM ADDING SECOND SCALE

P4

ADDING SECOND ADVISOR
L =
Lq =
W =
Wq =
Should the second advisor be added?
Explain

P5

a) USING CURRENT REPAIR SERVICE
W =
LOST REVENUES = per machine
b) USING NEW REPAIR SERVICE
W =
LOST REVENUES =
SAVING IN REVENUES =
EXTRA COST OF SERVICE =
24x vs. 12(x+10)
x x + 10 24x 12(x+10) difference
10
20
5