Mrs. Ida Smith has a 2019 net employment income of $90,000, taxable benefits of $3,500, an RPP contribution of $4,000, spousal support payments received of $12,000 and taxable capital gains received of $1,000. Her employer does not make a matching contribution to her pension plan and therefore her PA is $4,000. At the end of 2019, her Unused RRSP Deduction Room was $5,100 and she has $1,000 in undeducted contributions. During 2020, she contributes $5,000 to her RRSP and makes an RRSP deduction of $4,200.

1. earned income for RRSP purposes.
2. RRSP contribution limit for 2020.
3. unused RRSP Deduction Room at the end of 2020.
4. undeducted RRSP contributions at the end of 2020.