General knowledge Material- all Competitive

The simple and compound interest that can be earned in two years at the same rate is Rs 1,000 and Rs 1,040 respectively. What is the rate (percent per annum) of interest?
  1. 9
  2. 8
  3. 12
  4. 3
A trader had 1200 kgs of rice. He sold a part of it at 5% profit and the rest at 11% profit, so that he made a total profit of 7%. How much (in kg) wheat did he sell at 5%
  1. 900
  2. 800
  3. 700
  4. 600
A can do 75% of a job in 9 days and B can do half of the job in 8 days. If they work on it together, then in how many days can they do half of the job?
  1. 40/7
  2. 24/7
  3. 7/2
  4. 9/2
Area of 4 walls of a cuboid 400 sq cm, its length is 15 cm and height is 8 cm. What is its breadth (in cm)?
  1. 12
  2. 10
  3. 11
  4. 8
20% of a = b, then b% of 20 is the same as _________ of a.
  1. 80%
  2. 40%
  3. 8%
  4. 4%
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