How do you calculate a percentage profit or loss?

E.g I buy a top for $15, then sell it for $21. How do I work out the percentage increase?



or If I brought it for $21 then sold it for $15, what's the percentage loss?How do you calculate a percentage profit or loss?
let

p1 = original (purchased) price

p2 = end (sales) price

percent change is price:

(p2 - p1) / p1 脳 100

if result is positive, it's a profit

if result is negative, it's a loss

so

(21 - 15) / 15 脳 100 = 40% profit

and

(15 - 21) / 21 脳 100 鈮?-28.57% profit or 28.57% loss



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