SOLUTION: When the price of an item was increased by sh.5. I bought 2 items fewer with sh.200.what is the current price of an item.

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Question 1138872: When the price of an item was increased by sh.5. I bought 2 items fewer with sh.200.what is the current price of an item.
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
Let x be the lower price; then the greater price is (x+5).


For sh.200, you were able to buy  200%2Fx items.


For the same amount, you are able to buy  200%2F%28x%2B5%29  items at the increased price.


The difference is 2:


    200%2Fx - 200%2F%28x%2B5%29 = 2.


To solve this equation and to find "x", first cancel the factor "2" in both sides; then multiply both sides by x*(x+5).


    100%2Fx - 100%2F%28x%2B5%29 = 1

     100*(x+5) - 100x = x*(x+5)

     100x + 500 - 100x = x^2 + 5x

      x^2 + 5x - 500 = 0

      (x+25)*(x-20) = 0


The two roots are x= -25  and  x= 20,  but only positive value x= 20 is a meaningful solution.


ANSWER.  The price before increasing was sh.20;  after inceasing it became sh.25.

Solved.

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