Dub Wireless's marketing team spent $750,000 in 2014 to add 12,000 new subscribers. In 2015, Dub spent $865,000 to add 12,500 new subscribers. What was the marketing team's productivity growth rate from 2014 to 2015?

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The productivity in 2014 was 12,000 subscribers/$750,000 = 0.016 subscribers per dollar. In 2015, it was 12,500 subscribers/$865,000 = 0.01445 subscribers per dollar. The growth rate is (0.01445 - 0.016)/0.016 = -0.096875, or approximately -10.7%.

Dub Wireless's Marketing Team Spent $750,000 in 2014 to Add