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The number of cell phone subscribers in a country in the years 2000-2005 was projected to...

The number of cell phone subscribers in a country in the years 2000-2005 was projected to follow the equation N(t)=39t + 72 million subscribers in year t (t = 0 represents January 2000). The average annual revenue per cell phone user was $350 in 2000. If we assume that due to competition the revenue per cell phone user decreases continuously at an annual rate of 20%, we can model the annual revenue as R(t) = 350(39t + 72)e^0.2t million dollars.

(a) Determine when to the nearest 0.1 year the revenue was projected to peak.

b) Determine the revenue, to the nearest $1 million, at that time.

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