Question

deepa deposited Rs 1000 in first month Rs 1450 in second month and Rs 1900 in third month and so on up-to 5 years in a bank find the total amount that deepa deposited at the end of the 5 years​

Answer 1

Given, a = 1000

d = 1450 - 1000

Therefore , d = 450

Moreover , n = 5

Sn = n/2 [ 2a + ( n - 1 )d ]

S5 = 5/2 [ 2(1000) + (5 - 1 ) 450 ]

S5 = 5/2 [ 2000 + 4 × 450 ]

S5 = 5/2 [ 2000 + 1800 ]

S5 = 5/2 [ 3800 ]

S5 = 5 × 1900

S5 = 9500

Therefore, the total amount of money that deepa deposited at 5 years is Rs 9500.