Question

If the sale price is doubled, the profit becomes four times.than find the percentage of profit?

Answer 1

Let the cost price & profit be 100&x
then the selling price 100+x
then selling price is doubled then 2(100+x)
2(100+x)-100=4x
200+2x-100=4x
100+2x=4x
100=4x-2x
100=2x
x=50
4x=4×50
4x=200