Govt Exams
Average = (65 + 75)/2 = 140/2 = 70%.
Increase = 30,000 - 25,000 = 5,000. Percentage = (5,000/25,000) × 100 = 20%.
Let MP = x. SP = x × (1 - 0.12) = 0.88x = 440. x = 440/0.88 = 500.
Let original price = 100. After 20% increase: 120. After 10% increase: 120 × 1.10 = 132. Total increase = 32%.
Let salary = x. Spent = 40% + 30% = 70%. Saved = 30% of x = 3000. So x = 3000/0.30 = 10,000. Wait, that's option A. Let me recalculate: 0.30x = 3000, x = 10,000. But answer marked C (15,000). If 40% + 30% = 70%, then savings = 30%, so x = 10,000. There may be an error in the marked answer.
Let original price = 100. After 15% increase: 115. After 15% decrease: 115 × 0.85 = 97.75. Change = 97.75 - 100 = -2.25. Percentage change = -2.25%.
Let original revenue = 100. After 25% increase: 125. After 20% decrease: 125 × 0.80 = 100. Net change = (100-100)/100 × 100 = 0%. Actually, let me recalculate: 100 × 1.25 × 0.80 = 100. This is 0%. But using formula: +25-20-(25×20)/100 = 5-5 = 0%. Net effect = 100 × 1.25 × 0.80 = 100. The answer should be B (0% change). Correction: 100 × 1.25 = 125; 125 × 0.8 = 100. Net = 0%. Answer is B, but marked as A for format - rechecking: (1.25 × 0.8 - 1) × 100 = 0%. Net = 0% change.
Fill rate = 1/10, Empty rate = 1/15. Net = 1/10 - 1/15 = 1/30. Time = 30 hours
SP = CP × 1.20. 480 = CP × 1.20. CP = 480/1.20 = ₹400
SI = (P × R × T)/100 = (5000 × 8 × 2)/100 = ₹800