Final answer:
In 2011, there were approximately 43.63 times more cell phone subscribers than in 1991, which is calculated by dividing the number of subscribers in 2011 (331.59 million) by the number in 1991 (7.6 million).
Step-by-step explanation:
To calculate how many times more cell phone subscribers there were in 2011 than in 1991, you divide the number of subscribers in 2011 by the number of subscribers in 1991:
Number of times = 2011 subscribers / 1991 subscribers
Number of times = 331.59 million / 7.6 million
Number of times = 43.63 (to two decimal places)
So, there were approximately 43.63 times more cell phone subscribers in 2011 than there were in 1991.