can anyone solve this problem?

3. Suppose the country of Macroland's annual fiscal standing for six recent years. Assume that interest payments on the debt are covered by government expenditures and that budget surpluses are used to retire the debt. (Amounts are in billion of dollars) Year Government Tax revenues Deficit (-) or Surplus Debt expenditure (+) 1800 1800 1180 1780 2280 -1500 2100 500 2400 +100 2500 2600 a. Calculate the missing data b. What factors might affect government expenditures and tax receipts from year to year