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Cost price is the price at which we buy a thing and selling price is the price at which we sell a thing. Here we have given cost price is ranging from Rs. $200$ to Rs. $350$ and selling price is ranging from Rs.$300$ to Rs. $425$.

Now to find the greatest profit we have to buy those books at minimum cost price and we have to sell these books at maximum selling price so cost price for those books is Rs. $200$ per book and selling price for those books is Rs. $425$per book and we know that

Profit = Selling Price - Cost price

P = S.P. - C.P.

P = $425 - 200$

P = Rs. $225$

Hence there will be profit of Rs. $225$ per book and for 8 books profit will be

${\text{P = 225}} \times {\text{8}}$

P = Rs. $1800$