Mr Parekh got a job with salary Rupees 1,80,000 per year. His employer agreed to give Rupees 10,000 per year as increment. In how many years will his annual salary be Rupees 2,50,000 ?

Answer

In 8 years his annual salary will be Rupees 250000.

Explanation

Proof `:` There is an increment of Rupees 10,000 in salary per year.
This is an A.P. with d = 10,000.
Here, `a= 180000, t_(n) = 2,50,000, n = ?`
`t_(n) = a+ ( n-1)d ` ….(Formula)
`:. 250000 = 180000 + ( n-1) xx 10000`
`:. 25 = 18 + n-1` ....(Dividing both the sides by 10000)
`:. 25 = 17+n `
`:. n = 25 - 17`
`:. n = 8`