By selling

By selling an article for $ 21, a trader loses as much percent as the cost price of the article. Find the cost price.

Correct answer:

x1 =  70 USD
x2 =  30 USD

Step-by-step explanation:

 100 (x21)/x = x  100 (x21)=x2  100 (x21)=x2 x2+100x2100=0 x2100x+2100=0  a=1;b=100;c=2100 D=b24ac=1002412100=1600 D>0  x1,2=2ab±D=2100±1600 x1,2=2100±40 x1,2=50±20 x1=70=70 USD x2=30

Our quadratic equation calculator calculates it.




Did you find an error or inaccuracy? Feel free to write us. Thank you!







Tips for related online calculators
Are you looking for help with calculating roots of a quadratic equation?
Our percentage calculator will help you quickly calculate various typical tasks with percentages.
Do you have a linear equation or system of equations and are looking for its solution? Or do you have a quadratic equation?

You need to know the following knowledge to solve this word math problem:

Units of physical quantities:

Grade of the word problem:

Related math problems and questions: