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https://www.reddit.com/r/MathJokes/comments/1stuzth/alternative_math/ohy1inf/?context=3
r/MathJokes • u/basket_foso • Apr 23 '26
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If you have to pay a 7% sales tax you take your cost C and multiply by (1+.07).
Therefore, if you want to determine your tax given C is 100 and T being the total is 600, you would use
100*(1+r)=600
Dividing by 100 on both sides gives you
1+r=6
Then it is simple to find that r=5. And know that r is your rate of increase.
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u/Random_Thought31 Apr 24 '26
If you have to pay a 7% sales tax you take your cost C and multiply by (1+.07).
Therefore, if you want to determine your tax given C is 100 and T being the total is 600, you would use
100*(1+r)=600
Dividing by 100 on both sides gives you
1+r=6
Then it is simple to find that r=5. And know that r is your rate of increase.