In a sale, normal prices are reduced by 10%.

1 answer:

4 0

You do 54/x = 90%/100. As prices are reduced by 10%, 54 is 90% of the original number. After cross multiplying you get 5400=0.9x. Which turns into 6000. Adding the decimal point back on you get £60.00.

So the original price of the shoes is £60.00.

Checking: all you have to do is take 10% of 60, which is 6 and subtract 6 from 60 to get 54. Thus, 60 is your answer.

Hope this helps!

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$\bf \textit{sum of an arithmetic sequence}
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S_n=\cfrac{n(a_1+a_n)}{2}\qquad 
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so, that's the common difference... .so you'd surely know what the 3rd term is, notice the first one is 102.

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