Should I write an appeal letter?

BCMan2013
Mon, 21 Jun 2010 13:41:32 +0000

Last fiscal year, my parent’s gross income was ~63K, and BC expected us to pay ~8.5K (13% of our income).
This fiscal year, our gross income increased to ~82K (with no significant changes in other assets), and BC expected us to pay ~15K (18% of our income). Compare this with Cornell’s package (I applied as a transfer and turned it down), which was ~9.5K.
Should I appeal, and how should I go about it?