Solve DI Questions with Percentages Method

Solve DI Questions with Percentages Method

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)