John want to buy a $100 Trouser at the store, but he think itâ€™s too expensive. Finally, it goes on sale for $55. What is the percent decrease?  Choose the correct option:
A) 20 % B) 30 % C) 40 % D) 50 % E) 45 %

Rationale: "the is always the difference between our starting and ending points . in this case , it â € ™ s 100 â € “ 55 = 45 . the â € œ original â €  is our starting point ; in this case , it â € ™ s 100 . ( 45 / 100 ) * 100 = ( 0.45 ) * 100 = 45 % . e"
Answer: E