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a book seller sold a book for $100 and thereby gains $20. Find his gain per cent a) 20% b) 25% c)40% d) none of the above. plz i need help asap​

Answer :

ashlyn6317

Answer:

a.20%

Step-by-step explanation:

because of the book is 100$ and the thereby sold it and gained 20$ equals to 20%

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