Mathematics.
posted by LeighAnne. .
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.
Thank you in advance.

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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