Problem Solving

Q: Mark has a salary of $ 10800 per month. In the first month of the year, he spends 40% of his salary on food, 50% on clothing and saves 11.11% of what he has spent. In the next two months, he saves 9.09% of what he has saved( spending 38.33% of his income on food). In the fourth month, he gets an increment of 11.11% on his salary and spends every single cent on celebrating his raise. But from the fifth month onwards good sense prevails on him and he saves 12.5%, 15%, 20%, 10%, 8.33%, 12.5%, 15%, and 20% on his new income per month. The percentage difference between the sum of his savings for the two months having the highest savings to the sum of the savings for the two months having the lowest savings is :

a) 2.66

b) 5.33

c) 8

d) 9.88

e) None of the above