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Importance of Percentages in solving DI question

Published on Wednesday, June 21, 2017
DI

In this article we learn how we can calculate DI questions easily by developing tricks

The questions will be of following types:

  • X is what percentage of Y= X/Y * 100 
  • Y is what percentage of X= Y/X * 100 
  • X is what percentage less than Y= Y-X/Y * 100 ( X is what percent less than Y means indirectly we can observe Y is greater than X, So we are subtracting Y(higher value)-X(lower value), denominator depends upon with which it is compared. 
  • Y is what percentage more than X= Y-X/X * 100 ( Y is what percent more than X means indirectly we can observe Y is greater than X, So we are subtracting Y(higher value)-X(lower value), denominator depends upon with which it is compared. 

Frequently asked Questions:

To find 195/225 * 100

TRICK 1: 

Calculate in mind
Take 225 =100%
195 =?
22.5 =10% ,  225-195=30 , 22.5+6.5=30=10%+3%=13% (approx)
2.25= 1%   , 30=?,               100-13=87% (answer)

TRICK 2: 

Doubling method (double it until you feel the value is comfortable to calculate)

225 ,450,  900=100%,  90=10%,  9=1%

30,   60,    120=? (13%) (approx)
100%-13%=87% (Answer)

Question: If ratio is asked to find

TRICK: 

Double the number whenever we observe 5 at the ending
=195:225
=390:450
=13:15(Answer)

Question: What is the difference between Average of Cricket and Average of Tennis?

Cricket 250 200 225 215 200
Tennis 240 210 200 130 165

TRICK 1: 

Subtract and take average
=10-10+25+85+35/5
=29(Answer)

TRICK 2: 

Take 200 base value
For cricket 50+25+15=90/5= 18--------(1)
For tennis 40+10-70-35=-55/5= -11--------(2)
=18-(-11) = 29(Answer)
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ramandeep singh

Ramandeep Singh, your guide to banking and insurance exams. With 14 years of experience and 5000+ selections, Ramandeep understands the path to success, having transitioned himself from Dena Bank and SBI. He's passionate about helping you achieve your banking and insurance dreams.

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