Can Someone Please Show Me An Easy Trick For Figuring Percentages Please?

I used to know a little trick for making this easier but have since forgot. I need to know how to do the following as EASILY if possible. Thank you!!
examples:
30 is what % of 55?
What is 17% of 88?
and
70% of what is 35?
I’m also looking for EASY ways to calculate discount prices, like what is 15% off of $80? and what was the discount if a dress was $39 and is now $45? THANK YOU!!!!

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2 Responses to “Can Someone Please Show Me An Easy Trick For Figuring Percentages Please?”

  1. Ben says:

    A very simple method that I use on a day to day basis is to find what 10% is, and then continue from that. 10% is extremely easy to find, as you simple move the decimal place over one. From there you can find 5%, by halving the original 10. Add those together and you easily get your 15%.

  2. jane says:

    Percentages:
    30/55= %
    88•.17= #
    30/.70= #
    Discounts:
    80•.15= # ~~ 80- # = answer
    (do you mean was $45 and is now $39?)

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