SOLUTION: In a sale, there is twenty-five per cent off all prices. A tv costs £90 in the sale. How much was it before the sale?

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Question 939056: In a sale, there is twenty-five per cent off all prices.
A tv costs £90 in the sale.
How much was it before the sale?

Answer by srinivas.g(540) About Me  (Show Source):
You can put this solution on YOUR website!
Let x be the cost of TV before sale
In sale,cost=£90
25% off on price
Off on price=25%of x
=%2825%2F100%29%2Ax
=0.25 x
Hence x-0.25x=90
X(1-0.25)=90
X(0.75)=90
Divide with 0.75 on both sides
x%2A0.75%2F0.75=90%2F0.75
X=120
Result:price before sale(x)=£120