The following double line graph shows the income and expenditure of Mr. Henry over three months. During which month was the savings of Mr. Henry the highest?
The average monthly expenditure of Mr Ravi's family for the first three months is Rs.2,750, for the next three months is Rs.2,940 and for the last three months Rs.3,150. If his family saves Rs.4980 for nine months, find the average monthly income of the family for the 9 months?