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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

Math

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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? (1 point)

 a

112

 b

288

 c

360

 d

432