The meaning of 25% off is that you only have to pay 75% of the price on the jacket.
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The origin goes back to the Latin verb ‘Oboedire’ which means to serve.
Calculate the quantity of heat in joules needed to increase the temperature of 250 g of water from 20°C to 56°C. Specific heat capacity of water is 4.18 J°C-1g-1.