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Shortcut and Tricks: Computational Speed

Increase your mental calculation speed. It is essential that you develop an ability to calculate 10%, 1%, 2%, 5% of random numbers. You should be able to calculate average of six three-digit numbers in less than thirty seconds. 
e.g. to find the average of 514, 368, 975, 140, 674, and 807.

Be Meticulous

Look for the following:
  1. Units:
    you must pay attention to the fact that the figures may be given in thousands of rupees (example the figures for sales mentioned in Tabular Graph, as elsewhere in this assignment, are in thousand of rupees).
  2. Respect Footnotes:
    Certain graphs, especially financial graphs, may carry some footnotes. Typical footnotes may mention that a balance sheet pertains to only nine months or fifteen months instead of normal twelve months. Sometimes some d ta may be projected data only. Keep an open eye for such qualifying information, generally occurring at the bottom of the graph.
  3. Understand Percentage:
    It is essential to understand the basic concept of percentage because you may e required to compute percentage in about fifty percent of the questions. Please note the following nuances in percentage.
    A: Profit increased from 1996 to 1997 by Rs. 30 crores (150 – 120)
    B: Profit in 1997 was how many times the profit in 1996 = 1.25 times (150 / 120)
    C: Profit in 1996 was how many times the profit in 1997 = 0.8 times (120 / 150)
    D: Profit earned in 1997 was what percent more than the profit earned in 1996
    = 25% = (150 – 120)/120*100. We can also say that the profit earned in 1997 was 125% of the profit earned in 1996.
    E: Profit earned in 1996 was what percent less than the profit earned in 1997
    = 20% = (120 – 150)/150*100. The –ve sign signifies that profit was lower in 1996 than in 1997. also say that the profit earned in 1996 was 80% of the profit earned in 1997.
  4. Rapid Eye Movement:
    Data Interpretation requires that you have a roving eye–always on the lookout for data.

Develop a Sense of Approximation

You should develop a knack (believe us this can be developed through a lot of practice only) for approximation. Keep in mind that one can use approximation only when the answer choices are distant/ far removed.
Grasp the following illustration:
No. of Patients listed by the type of ailment
  RVG Hospital PKR Clinic JP Hospital
Tuberculosis 123 201 68
AIDS 41 61 34
Leukaemia 23 79 47
Laryngitis 18 8 12
Neurosis 16 6 74
The average number of tuberculosis patients in the three institutions is nearly
  1. 147
  2. 169
  3. 131
  4. 119
(Now the untrained candidate would add 123, 201 and 68 and divide by 3 to get the answer. What the smart candidate does is to add 120, 200 and 70, gets a total of 390 and divides by 3 to get 130 and so marks the choice (c))
The RVG Hospital has what per cent less patients in AIDS than those in PKR Clinic?
  1. 34.45
  2. 32.78
  3. 35.68
  4. 30.78
(Again the smart candidate finds 20 is what per cent of 60, it being 33.33%, understands the actual answer should be slightly less and thus marks choice (b), whereas the dumb candidate actually does the operation 20/61*100, wasting valuable time.)

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