Answer:
a. decreased by 4%
Step-by-step explanation:
PRODUCTIVITY OF INDUSTRY IN 2011
= TOTAL OUTPUT PRODUCED/ TOTAL WORKING HOURS
PRODUCTIVITY OF INDUSTRY IN 2011 = 60,000/640
= 93.75%
PRODUCTIVITY OF INDUSTRY IN 2012
= TOTAL OUTPUT PRODUCED/ TOTAL WORKING HOURS
= 76,500/850
= 90%
Therefore, Productivity at Modern Electronics decreased by 4%