This is a clustered bar chart. Instead of displaying the products on the X-axis with the sub-bar representing the year, this chart puts it the other way around with the year on the X-axis and the name of the Startup as the sub-bar.
This is a good example of the kind of math you will see on the GMAT exam. While typical Problem Solving questions involve the use of fairly easy-to-use numbers like 4,000 and 25---they are not what you would actually see in the real world.
In the real world, you'll see tables and charts just like this one. Some of the numbers are in thousands and millions. Other numbers will be in billions or even simple fractions. What happens when you combine all of them? What if you're asked to divide something in the billions by something in the thousands? Can you so the math easily in your head?
Yes, you do have the on-screen calculator - but do you really expect to not make any errors entering all the zeroes into the calculator?
You don't want to rely on the calculator for these big numbers. You're going to have to learn how to simplify seemingly complex numbers into values that are easier and faster to calculate. This question above is a perfect example of this kind of math you'll see on the integrated reasoning section. In this case, they just happen to present it in a graphical interpretation question type format.
source: GMAT Pill - Clustered Bar Chart
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