This is supposed to measure the market share concentration of industries all in the same area. I take it a low HHI is not very concentrated and a large number (10000) means that the market share is very concentrated. The answer I get is about 1700 which means there is not much concentration.
Firm % % squared
a 30 900
b 20 400
c 10 100
d 10 100
e 10 100
f 5 25
g 5 25
h 5 25
j 5 25
Total 100% 1700
So to get an idea how concentrated everything is, you square the % s and add them up. I don't think the there is a monopoly in this industry. It is pretty evenly spread out.
One posture that places a person at risk for injuries from poor ergonomic practices is slumping, not sitting properly and placement of keyboard, mouse and not maintaining the recommended distance from screen.
the answer would be letter b
It is probably safe to say that most if not all decisions involve trade-offs. For example a person may be offered a job that pays well but requires 7 days per week for a month and while this is good for a younger person with no other commitments it may not work for an older person with his own family commitments and other projects. Another decision could be that for support, a husband decides to not take on major time consuming projects while his wife is doing intensive studying to become certified in a field of her choosing so that he can support her. Another example is that when one cannot drive one's son with a disability to a beach to swim because it is too far and uses too much car gas, the money saved on gas some of it could be spent on his groceries.
Your data would not be considered duplicated.