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Explanation: Perimeter = 4 × 21 = 84 cm.
Explanation: (52 + 60 + 68 + 80) / 4 = 260 / 4 = 65.
Explanation: Product of numbers = LCM × HCF = 72 × 6 = 432 → 432 / 18 = 24.
Explanation: n(n+1)/2 = 12×13/2 = 78.
Explanation: SP = CP + Profit = 900 + 180 = 1080.
Explanation: Correct: SI = (P × R × T) / 100 is the standard simple interest formula. Option1 and Option2 are dimensionally wrong. Option4 is the compound interest formula, not simple interest.
Explanation: SI = (1000×5×2)/100 = (1000×10)/100 = 1000×0.1 = 100. Option1 (50) is for 1 year at 5%. Option3 & Option4 are too large.
Explanation: SI = (1500×4×3)/100 = (1500×12)/100 = 180. Amount = 1500+180 = 1680. Option2 (1620) would be SI=120; Option3 (1560) SI=60; Option4 incorrect.
Explanation: P = SI×100/(R×T) = 240×100/(6×2) = 24000/12 = 2000. Other options give wrong division results.
Explanation: R = SI×100/(P×T) = 120×100/(800×3) = 12000/2400 = 5%. Option1 gives too small SI, Option3 & Option4 too large.
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