I was just wondering if someone can tell me how to work this out,

if I bought some item for £4,400 and sold it for £5,100 what is my percentage profit?

I know that I have made a profit of £700 but in terms or percentages?

I did try this; $\displaystyle \frac{100}{700} = 0.1429 $ than multiply by 100 to get 14.286%, but than 14.286% of 4,400 does not give me 5,100.

any help/ advice appreciated.

thanks