in 2003 brijesh paid a tax of 20% of his salary. in 2004 his salary increased by 93×3/4 % and the tax scheme changed. under the new tax scheme he had to pay a fixed sum of rs.1000 and an additional 20% on the amount above rs 10000. his salary in 2004 was more than rs 10000 and he paid a tax of rs 500 more than what he paid in 2003. what is his salary in 2004