SOLUTION: Asif purchased a car for Rs 360000.The amount is payable in forty monthly installments which are in arithmetic progression. After paying 30 installments one third of the amount wou

Question 857975: Asif purchased a car for Rs 360000.The amount is payable in forty monthly installments which are in arithmetic progression. After paying 30 installments one third of the amount would remain unpaid.The amount which Asif would be required to pay as the 35th installment is:
(a) Rs. 11600
(b) Rs. 11700
(c) Rs. 11900
(d) Rs. 11800
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
S = �(2a + (n-1)d)n
360000=�(2a + 39d)40,
240000=�(2a + 29d)30
a1 = 5100, d = 200
A35 = 5100 + 34*200
A35 = 11900
(c) Rs. 11900
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