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XxMsBelieverxX21
2 and a half kg of tomatoes- 1.50 per kg. 
Since we know how much it costs per kg and we know how many kg's there are (2)  we would add 1.50 and 1.50 to make 3.  and about  half of 1,50 is 75 so I would say £3.75
good job