The Gross Domestic Product of a country for a given year is the sum of the market values of all goods and services produced within the country during that year. The Gross Domestic Product per capita is found by using the following formula:

S=C+I+G+NPwhere S = Gross Domestic Product per capita, C = consumer spending, I = investment, G = government purchased, N = net exports, and P = population. Which of the following shows the Gross Domestic Product per capita solved for I?