If the monthly traveling expenses of a person are partly constant and partly vary with the number of miles that he travels in a month. When he travels 150 miles the total traveling expenses are Rs 800 and when he travels 180 miles the total traveling expenses are Rs 900. Find the total monthly expenses in a certain month in which he traveled 300 miles?

• Find the variable expenses per each mile of travel:
  For 180 miles of travel, expenses=Rs.900
  For 150 miles of travel, expenses=Rs.800
  Thus for 30 miles, the difference in travelling expenses=Rs.100
  For each mile of travel, the travelling expenses= Rs.100/30
  Now, find the fixed expenses:
  For 180 miles, the variable expenses=180*100/30=Rs.600
  Hence, the fixed expenses=Rs.900-600=300
  Now, for travelling 300 miles, the total Expenditure is:
  300*100/30+300=Rs.1300
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