# Mathematics.

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In the sales, a CD player costs £64 from Electrics 'R' Us and the same CD player costs £64.60 from Music World.

Electrics 'R' us - 1/5 off normal price.

Music World - 15% off normal price.

Which shop has the cheapest normal price.

• Mathematics. -

ER , 1/5 off , 4/5 normal , 80% normal
... normal = 64 / .80

MW , 15% off , 85% normal
normal = 64.60 / .85

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