Respuesta :
502/1000 is closest. Easiest way to determine this is to use a calculator, convert all to decimals, and compare.
1/2 = 0.50
9/20 = 0.45
99/200 = 0.495
26/50 = 0.52
51/100 = 0.51
502/1000 = 0.502
closest is gonna be 502/1000
9/20 = 0.45
99/200 = 0.495
26/50 = 0.52
51/100 = 0.51
502/1000 = 0.502
closest is gonna be 502/1000