Chapter 14.5, Problem 43E

(a)

To determine

To calculate: The average annual revenue per cellphone in year $t$ where average annual revenue in $2000$ was $350$ dollar. The model is $N\left(t\right)=39t+68$ millions of subscribers to cellphone in early $2000$ in China.

(b)

To determine

To calculate: Thetotal revenue per cellphone from year $2000$ to the indefinite future where average annual revenue in $2000$ was $350$ dollar. The model is $N\left(t\right)=39t+68$ millions of subscribers to cellphone in early $2000$ in China.