Chapter 4.2, Problem 2E

Reminder Round all answers to two decimal places unless otherwise indicated.

U.S Investment Abroad In $1980$, direct U.S. business investment abroad was about $13.5$ billion dollars. From $1980$ through $2010$, that investment grew at an average annual rate of $11.24\%$.

a. Make an exponential model that shows the U.S. direct investment aboard A, in billions of dollars, $t$ years after $1980$.

b. From $1980$, how long did it take for U.S. investments abroad to double?

c. According to the model, how long would it take from $2010$ for investments abroad to double the level present in $2010$?