Entrance Exams
Govt. Exams
Let CP = 100. MP = 140. SP = 140 × 0.9 = 126. Profit% = (126-100)/100 × 100 = 26%.
A = P(1 + R/100)^T. 3600 = P(1.1)^3 = P(1.331). P = 3600/1.331 ≈ Rs. 2703.67.
SI = (P × R × T)/100 = (1000 × 8 × 2)/100 = Rs. 160.
Downstream speed = boat speed + stream speed = 15 + 3 = 18 km/h.
Relative speed = 40 + 50 = 90 km/h = 25 m/s. Total distance = 120 + 180 = 300m. Time = 300/25 = 12 seconds. [Recalc: 12 seconds should match option C. Time = 300/25 = 12 seconds]
Net rate = 1/12 - 1/18 = 3/36 - 2/36 = 1/36. Time = 36 hours.
A's work rate = 1/15, B's rate = 1/20. Combined = 1/15 + 1/20 = 7/60. Time = 60/7 ≈ 8.57 days.
SP = CP × (1 + profit%). 480 = CP × 1.2. CP = 480/1.2 = Rs. 400.
Let number = 100. After 30% increase: 130. After 20% decrease: 130 × 0.8 = 104. Net change = 4% increase.
Let value = 100. After 25% increase = 125. After 20% decrease = 125 × 0.8 = 100. Net = 0%. Recalculate: 125 × 0.8 = 100. No wait: 125 × 0.8 = 100. Check: 5% increase option seems wrong. Answer is no change