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How to calculate interest in the mind

We often have to quickly calculate the interest inMind, but the calculator is not always at hand. For example, you went to the store and you need to calculate how much the thing will cost at a discount or how much tip to leave the waiter.

If you often encounter this problem, "so simple!" Prepared for you a useful video tutorial, which clearly shows how you can quickly calculate percentages in your mind. Look and learn!

How to count interest in the mind

If you think without interest of interest, then show this video to your children. They will be happy to see such an illustrative example and their Lessons in mathematics Will greatly improve!