Question 1099615
number of notebooks* cost per notebook=200
p* cost=200
cost=200/p
after
number is now p-1* cost is (200/p-1)=200


(200)/(p-1)-10=(200/p), after cost is 10 more, so subtract 10 to make both the same.
multiply everything by p(p-1)
200p-10p(p-1)=200(p-1)
200p-10p^2+10p=200p-200
-10p^2+10p+200=0 or
p^2-p-20=0, dividing both sides by -10
(p-5)(p+4)=0
p=5 notebooks, with original cost of $40 each. ANSWER
after the price increase, for $200, four notebooks could be bought.