An electronics manufacturer makes remote control devices for interactive-cable-TV systems. The following assembly tasks must be performed on each device.

Task	Description	Predecessor(s)	Time (min.)
A	Place circuit into circuit frame	--	0.50
B	Solder circuit connections to central circuit control	A	0.70
C	Place circuit assembly in device frame	B	0.40
D	Attach circuit assembly to device frame	C	0.30
E	Place and attach display to frame	--	0.30
F	Place and attach keypad to frame	--	0.20
G	Place and attach top body of device to frame	E, F	0.35
H	Place and attach battery holder to frame	D	0.40
I	Place and attach bottom body of device to frame	G, H	0.60
J	Test device	I	0.30

Draw the precedence diagram for this problem, then determine the following:

a. What is the sum of the task times? [ Select ] ["25.9", "4.67", "5.34", "4.05"] minutes

b. What cycle time will allow the production of 200 units over a ten-hour day? [ Select ] ["1.78", "3.9", "15", "3"] minutes

c. What is the theoretical number of workstations needed? [ Select ] ["5", "3", "2", "1"]

d. Balance this assembly line using the heuristic longest operation time, what is the actual number of stations? [ Select ] ["1", "5", "2", "3"]

e. What is the efficiency based on your answer to letter d? [ Select ] ["72.3%", "85.0%", "67.5%", "35.9%"]

f. How much idle time is in this process based on the longest operation time?