1. A blue cap and a white cap costs twice as much as a red cap and a green cap, but only a pound more than a blue cap and a red cap. If a white cap and a green cap comes to seven pounds and 49 pence, how much would it cost to buy one cap of each colour?

20 pounds 24 pence for four caps

18 pounds 68 pence for four caps

19 pounds 47 pence for four caps