Price of car in 2009 = $120000
Value decreased by 20 % in 2010
⇒ Price of car in 2010 = $120000 - (20% of $120000)
= $120000 - ( (20/100) × 120000 )
= $120000 - $24000 = $96000
Value again decreased by 10 % in 2011
⇒ Price of car in 2011= $96000 - (10% of $96000)
= 96000 - ((10/100) × 96000 )
= 96000 - 9600 = $86400
So value of car at end of 2011 is $86400
I hope this is correct.
I hope this helps you and who ever else happens to see this.