"Dollars equal ten cents" joke

Theorem: 1$ = 10 centProof:We know that $1 = 100 centsDivide both sides by 100$ 1/100 = 100/100 cents=> $ 1/100 = 1 centTake square root both side=> squr($1/100) = squr (1 cent)=> $ 1/10 = 1 cent Multiply both side by 10=> $1 = 10 cent