The best thing to do is break it down to what you know
half of 200 is 100
half of 50 is 25
and half of 4 is 2
add the numbers up. 127, but don't forget it's a decimal because dealing with money, so 1.27
this would be 1.27/2.54 and 1.27 is half of 2.54, so the fraction is 1/2