by Cathy
(Metamora, MI )
If someone wants to make $10.00 when selling an item and I get 40% how much do I need to add to $10.00 it's not coming out when I add 40% to 10.00
You cannot take 40% of 10 because that someone is not sharing 10.00 with you. He or she is willing to share a bigger amount. So you have to add something to 10 dollars. 40% of the new amount is your share
let x be what we add to 10 dollars and that is your share!
40% of (10 + x)= x
Notice that 40% of the new amount(10+x) has to equal to your share or x. Does that make sense?
0.40 (10+ x) = x
4 + 0.40x = x
4 = x  0.40x
4 = 0.60x
x = 4/0.60 = 6.6666666
So you have to add 6.66666 to 10 to get 16.666666
Take 40% of 16.6666. Of course, it is equal to 6.66666 and 16.666666 6.66666= 10
Not so easy problem. Good question Cathy!
Comments for Percentage






New math lessons
Your email is safe with us. We will only use it to inform you about new math lessons.
Jan 13, 17 01:28 PM
What is the harmonic mean? How to calculate the harmonic mean?