Up up and away

Prices seem to be going up for food.
For some places, it seems like GST is the reason, but their increases dont seem to tally with the 2% GST increase.

McDonalds has increased their prices.
So now i will have to pay more for food which is not filling for me.
I'll just stick to coffeeshop food.

And that day i went to Broadway, and all the food from the zhi char stall seemed to have increased by 50 cents.
Of course the fried rice still portion still is like a mountain.
But now its 3.50.
Well, i'd still pay 3.50, but why the price increment?

One of my friends said its because they made a new menu, with coloured pictures.
But come on, i'm eating the rice or eating the menu?
besides, i already know what i want to eat what.