equation formula - C = a ( 1r) x Example 2 13. ECONOMIC GROWTH One way to describe the economic health of a country is the change over time of its gross domestic product (GDP), which is the value of its goods and services. In 2005, the GDP per capita of a country was $955, and it increases by about 1.35% per year. a. Write a function that represents the GDP per b. After how many years will the per-capita GDP person y of the country x years since 2005. be $1500? Round to the nearest year if necessary. 14. PRICING The introductory price that a company charges for new model of computer is $1200. The company lowers the price at an annual rate of 4.5%. a. Write a function that represents the price y of b. After how many years will the price of the the computer after x years. computer have decreased to 75% of the original price? Round to the nearest year if necessary. 15. BISON In 1900, researchers began monitoring the increase in bison population at a national park. Starting from a population of just 21 bison, the number grew at a rate of 18% per year during the study period. a. Write a function that represents the number y b. At the rate of 18% per year, how many years of bison in the state park after x years. would it have taken the number of bison to increase to about 150? Round to the nearest year if necessary. Extra Practice Solving Exponential Equations and Inequalities