Question

when a cell phone is sold for $20000, kemar made a profit of 25% on the cost price. what is the cost pric

Answer 1

so, Kemar sold it for $20000, and that was bumped up in price by 25% then.

now, if the cost was say "x", that is the 100%, we know he sold it for 25% more than that, namely the 125%, so if 20000 is the 125%, what is "x", the 100%?


`\bf \begin{array}{ccll} amount&\%\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 20000&125\\ x&100 \end{array}\implies \cfrac{20000}{x}=\cfrac{125}{100}\implies \cfrac{20000\cdot 100}{125}=x`