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Simple interest for 4 years = ₹1,280 Simple interest for 1 year = ₹1,280 ÷ 4 = ₹320 Principal = (Simple interest × 100) ÷ (Rate × Time) = (320 × 100) ÷ (8 × 1) = ₹4,000 For compound interest: A = P(1 + r/100)^t A = 4000(1 + 8/100)^2 = 4000(1.08)^2 = 4000 × 1.1664 = ₹4,665.6 Compound interest = A - P = ₹4,665.6 - ₹4,000 = ₹665.6 ≈ ₹666 Correct Option: b) ₹666
178    168    148   ?     78    28
64, 66, 69, 74, 81, ?
What will come in place of the question mark (?) in the following series?
28, 45, 75, 118, 174, ?
43          86          258        ?             5160                     30960
...156, 172, 196, ?, 268, 316
660, 653, 639, 618, 590, ?
13, 14, 23, 48, 97, 178, ?
362 452 550 656 770 892 ?
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