a) Under low inflation rate or downward pressure over inflation will affect the production and supply of oil. Its prices will fall below its actual level. At this situation, the central bank will lower its interest rate to boost the investment rate. Higher level of investment will protect the oil industries. Central bank increases the money supply to economy to increase the demand for oil products. Thus the demand will increase, with respect to this, the price of oil products will increase. The money supply will maintain the low inflation rate and increase the profit level of the oil firms. The central bank measures were used to increase the market rates. Thus the bank rate and other bank policies will be implemented in a proper manner to remain inflation in a normal level. Reducing bank rates will attract more customers to the bank and demanded more money. Thus the aggregate demand will increase.  
b) If higher inflation in the market, central bank will cut their rates and increase the savings among the people. The tight job market conditions can improve through expansionary fiscal policy. Thus new job opportunities by the firms increases with higher level of government spending. The higher level of inflation will affect the consumers and their consumption pattern. On the other hand, the inflation also occurred due to higher amount cash existed in the economy. So central bank implements higher interest rate to attract more savers to the market. Thus the saving rate will increase and squeeze the money from the economy. The tight job market can be released through higher job opportunities. So inflation can be reduced by efficient monetary policy and job opportunities can be increased through higher level of spending by the government and authorities.
c) The inflation target is below its actual level. Increasing bank rates will increase the inflation rate. The increasing interest rate will increase the saving level in the economy. This will moderate the demand and slow sown the inflationary pressures. At this situation, which is the actual inflation is less than the targeted inflation, the economy will move towards a lower growth rate. Thus the MPC will cut down and stimulate the aggregate demand.
d) Here the actual GDP is above the potential GDP, the inflation will increase in a higher level than the actual level. Thus the central bank will crowd out the money through increasing its rates. Thus the money will be squeezed from the economy to maintain a balance between the potential GDP ad actual GDP. The interest rate and bank rate will determine this equality.