Joe’s Cross Fit, an accrual method taxpayer, provides personal training services. On October 30, 201

Joe’s Cross Fit, an accrual method taxpayer, provides personal training services. On October 30, 2019, Barbie pays Joe’s Cross Fit $2,400 cash for 24 months of personal training services ($100/month). Barbie’s training sessions beginning on November 1, 2019. For book purposes, Joe's Cross Fit will recognize $200 in income in 2019, $1,200 in 2020, and $1,000 in 2021. For tax purposes, how much of the $2,400 must Joe’s Cross Fit include in gross income in 2019 if Joe’s elects to defer prepaid income to the maximum extent possible?