1.Xanthipi decided to charge her cell phone using petrol. Petrol costs 2 € per litre. She needs 3.5 litres to charge her mobile. How much money will it cost?

2. Xanthipi will charge her mobile with natural gas. If 1.5 litre of gas costs 2 € and if 3 litres are needed, how much would she pay?

3. Xanthipi needed 6 hours to charge her mobile phone. Each hour of charging costs 2 €. Whereas, Holly needed 10 hours to charge her mobile phone. Each hour of charging costs her 1,5 €. Whose mobile has been charged more rapidly? Whose mobile cost less to be charged?

4. Xanthipi has charged her mobile phone for an hour and that cost 6 €. If she charged it for 50 minutes, how much would it cost?

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