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First of all you need to work out the cost of One gram 40/12=3.33333333 pence Then multiply the cost of One gram by 600 to get the cost of Six hundred grams 3.33333333*600 = 2000 pence or £20.00 -------------------------------------------- Alternatively 600/12 = 50 and 50 times 48 pence = 2000 pence or £20.00
50% off is the same as saying the shirt costs 50% of its original cost. 50% of original cost = 19.50*50/100 = 9.75
0.05%
NONE!
In the 5th month they cost the same. Before and after that the costs are different.