A social networking site recorded that 80% of the people who became members of the site one month were between 30 and 40 years old. The equation below represents this information, where x represents the total number of people who became members of the site that month:


x = 0.8x + 72


How many people who became members of the site that month were between 30 and 40 years of age?


112

288

360

432