How much does a plate of chicken rice in 2040?

I remember that in my primary school times in 1980s, I always go to hawker center near my place to eat chicken rice. The normal type cost $1.20. During my secondary school, the chicken rice cost $1.50 and in my unversity time is cost $2.00. Now in 2009, the chicken rice cost at least $2.50 in hawker center, and in food court at least $3.50. Wow, from $1.20 to $3.50, nearly increase 3 times. See the chart below to find out how much a plate of chicken rice might cost in 2040.