Ratio and Proportion

How many $$cm$$ in $$28\ m$$?
$$1\ m=100\ cm$$
Sushma bought a saree from the mall. she paid $$Rs 2640$$ for it. When she came home she measured the length of the saree and found that the saree was half metre less in length then what the shopkeeper had told her. She found that she is at a loss of $$Rs 220$$ because of this. What is the length of the saree she brought home?
One $$cm$$ is equal to $$10\ mm$$. How many squares $$mm$$ are there in one square $$cm$$?
Find the order relation between the following pairs of ratios. a, b, c are integers. 
Find the value of unknown $$x$$, if :