Deriving and changing the subject of formulae
 

Deriving and changing the subject of formulae problem 28


At the market we bought 1 kg of prunes at 9 euros per kilogram, 1 kg of cottage cheese at 4 euros 95 cents per kilogram and 2 kg of cheese at 12 euros 56 cents per kilogram. At the cashier office we notice that we had a short fall of 10 euros 96 cents. Calculate how much the bill was and how much money we had in our wallet .


 

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