Question

Rahul wish to buy a laptop. he can buy it by paying rupees 40000 cash or by giving it in 10 installments as rupee 4800 in the first month, rupee 4750 in the second month, rupee 4700 in the third month and so on. if he pays the money in this fashion, find (1)total amount paid in 10 installments. (2)how much extra amount that he has to pay than the cost?​

Answer 1

Step-by-step explanation:

Amount paid in 1st month - Rs. 4800

in 2nd month - Rs. 4750

i.e 4800, 4750, 4700........

a = 4800

d = - 50

n = 10

(1) S = n/2 (2a + (n-1)d)

S = 5(9600 - 450)

S = 45750

(2) amount extra paid = 45750 - 40000 = 5750