Aptitude: Graph Based Problems Tricks

Consider the below graph and answer the below questions based on the data given in the Graph.

Model 1: 

The following Line Graph shows the cost of 1 Kg of Apple and 1 Kg of Mango in 4 different cities.

Find the

1. Cost of 12 Kg of Apple and 8 Kg of Mango in Delhi respectively
2. Difference Between 4 Kg of Apple in Mumbai and 2 Kg of Mango in Kolkata 
3. State in which the difference between the cost of 1 Kg of Apple and 1 Kg of mango is the Second Highest.