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 (mins)
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 task times in minutes?

b. What cycle time will allow the production of 200 units over a ten-hour day?

c. What is the theoretical number of workstations needed?

d. Balance this assembly line using the heuristic longest operation time, what is the actual number of stations?

e. What is the efficiency based on your answer to letter d?

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