how do i calculate percent stuff in my head?

Question

like if something is on sale

why are ppl here on polls and survey so useless?

Answer 1

It's kind of hard to calculate it in your head. I, for one, use a calculator.

So if you wanted to buy something that is on sale, you would take 100 minus the sale percentage of the item. You will then convert that answer into a decimal. Finally, you will multiply the decimal times the original price of the item giving you the sale price.

For example, let's say you wanted to buy a $20 shirt for 5% off. You would take 100-5 to give you 95%. Convert 95% to a decimal, which would be .95. Now take $20 x .95 and you get $19, which would be the sale price.

Also, if you wanted to buy an item that had a sales tax, you would just add 100 to the tax percentage of the item and do the same thing.

Answer 2

i remeber from math type, you may want to locate percents with the aid of fixing them right into a fragment. as an example, 50% is an similar as one 0.5, so if something change into marked 50percentoff, that would want to be the same as 0.5 off. the most effortless ones we had to keep in ideas were: a million/4 = 25% , 2/4 = a million/2=50%, 3/4=75%, 4/4=a million=one hundred% a million/5=20%, 2/5=40%, 3/5=60%, 4/5=80% a million/3=33 a million/3%, 2/3=sixty six 2/3% a million/10=10%, 2/10=20%, ect. if the question is searching the thanks to strengthen something with the aid of 5%, all you should do is divide even if that ___ is with the aid of 20 and then upload the answer to ___. an abacus is basically a column of bars with 10 beads on each bar. the first bar might want to, likely stand for ones, this signifies that one bead might want to equivalent a million and 10 beads might want to equivalent 10. the subsequent bar might want to equivalent tens, so one bead = 10 and 10 beads = one hundred. the subsequent bar is thousands, a million bead = one hundred, 10 beads = one thousand. an abacus is maximum as a rule used to count number great numbers. as an example, say you volunteered to count number the style of human beings that attended a protest. you may want to apply the beads to keep music of the persons. on the first bar (ones) you may want to slip one bead in the course of the bar for each between the first ten human beings. you may want to easily count number upto ten human beings for the first bar , then for each ten human beings you counted, slide over one bead on the second one bar to face for tens, and slide the beads on the first bar decrease back and commence counting ones lower back. after yet another ten human beings, slide over a second bead on the second one bar to face for twenty human beings. once you attain one hundred, you may want to slip over one bead on the third bar for one hundred. then after one thousand, one bead on the fourth bar for (one thousand).

Answer 3

I don't do it in my head. I carry a calculator and do it. I'm not standing there doing that. Use a calculator you can get them for a buck.....

Answer 4

Think about it

Answer 5

hun!, dont waist your time like that!