Here, a = 5000 , d = 200 and a n = 7000 a n = a + (n - 1)d → 7000 = 5000 + (n - 1)200 → 2000 = 200(n - 1) → n - 1 = 10 → n = 11 In 2005, his income will reach Rs. 7000. 8