The line chart given below represents the salary and expenditure (in Rs) of Guru Gulab Khatri for the given period.
It is given that the salary is greater than the expenditure atleast for four years. All the values are multiples of 5.
A year is said to be comfortable, if Guru Gulab Khatri is able to save atleast 30% of his salary. How many years are comfortable during the given period?