Mastering Shortcut Techniques save time and score
Shortcut techniques can increase your speed as well as accuracy in SSC-CGL Exam. A simple illustration below on the calculation of compound interest will tell you how you can go about doing it.
The formula for calculation of compound interest is P (1 + r/100)T – P, where,
P = Principal amount,
r = rate of interest % p.a., and
T = time period in years.
This is a known formula learnt during your school days.
When P = Rs.12,000/-, r = 10% per annum and T = 2 years, what would be the compound interest at the end of 2 years?
Everyone knows the conventional method, so look here at the shortcut technique.
The Best Method
Rohit Agarwal, a National level trainer with TalentSprint, recommends that you adopt the effective percentage method by using the formula this way:
Compound Interest for 2 years = a + b + ab/100, where
“a” is the rate of interest in % for the 1st year, “b” is the rate of interest in % for the 2nd year and “ab/100” is the interest on interest earned during the first year. Summing up that gives you
a = 10% (interest for the first year)
b = 10% (interest for the second year)
ab/100 = 1% (interest on interest earned in the first year)
The effective rate of interest works out to 21% (10% + 10% + 1%). The compound interest at the end of the 2nd year is 21% of Rs.12,000/- which is Rs.2,520/-. Since there will be multiple choices, the trick is to zero-in on the right option faster than others.
In this case, 21% of Rs.12,000/- can be calculated by using the method of ‘split and merge’. Split 21 into 20 + 1 and calculate. 20% of Rs.12,000/- is Rs.2,400/- and 1% of Rs.12,000/- is Rs.120/-. Merge by adding Rs.2,400/- and Rs.120/- to arrive at Rs.2,520/- which is the right answer.
Watch this video: https://www.youtube.com/watch?v=pbGWXsNbMEs to know more on how you can make the most of the shortcut techniques.
It is always a good idea to go in for professional coaching Institutes to learn more such powerful shortcuts. It will save your valuable time of reinventing your own techniques. One such Institute is TalentSprint which not only offers videos on shortcut techniques but also Live problem-solving classes, video lessons, personalised learning plan and more. This will help you solve every doubt that you have and develop speed and accuracy in solving problems which are critical to succeed in SSC-CGL Exam. Competition is very high in this exam and every moment is important. You cannot afford to rely on mere mock test providers or only books.
A complete learning solution is what you need.
SSC Recruitment Notifications – Click Here