It is 30/300 which you can simplify, if you so wish.
Three Pounds consists of 300 Pence, therefore there would be 30 x 10 Pence in Three Pounds.
1/30
1/10
It is 100*300/54 = 555.55... %
fraction of 3 is 50 = 50/3
As there are 100 pence in 1 pound Sterling, 300 pence is £3.00.
50 p / £3 = 50 p / 300 p = 1/6
It is 50/300. The fraction can be simplified but doing so will result in a loss of information about the accuracy of the number.
It simplifies to 30/1.
1.5/30 = 15/300 = 1/20 or 0.05
300/540 = 30/54 = 15/27 = 5/9