Work out percentage discounts instantly!

Working out percentage discounts is easy, just use one or two of the tricks suggested in this math lesson.
To work out the discount subtract from one hundred percent, then use a mental break up technique to calculate the percentage discount. To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
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