Mr X ,a businessman had the income in the year 2000,such that he earned a profit of 20% on his investment in the business.In the year 2001 ,his investment was less by Rs 5000 but still had the same income(income=investment+profit) as that in 2000.thus,the percentage profit earned in 2001 increased by 6% .what was his investment in 2000?

a)102000 b)150500

c)105000 d)non of these