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

A) What is the task time?

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?

>>>> I got these answer but I keep being told they are wrong <<<<<<

A) 4.05 mins

B) 3 mins

C) 2 stations

D) 2 stations

E) 67.50%

F) 1.95 mins

I guess I made an error so please help :)