Question

A store owner buys cell phones for 40.00 and marks up the price by 25%. explain how to find the price at which she sells the cell phones.

Answer 1

We use proportion in this problem solving.
We know that 100% = 40.00 and 125%=x
I take 125% because the marks the price up 25%. So it is 100%+25%.
100x=40.00×125
x=40.00×125÷100
x=50.00
So the she sells the cell phone at 50.00