On april 1 2009 joy ltd sold a land for $100,000. the note will be colleccted as follows: $20,000 in 2009, $30,000 in 2010 and $50,000 in 2011. The property had cost yo $20,000 when it was purchased in 1998. under installment-sale metjod, what is the amount of gross profit realized in year 2011?