I really don't understand 1.25%0.5

Answer 1

multiply them in a power of 10 to don't have any floating point (in your example it must be 100)
then calculate the answer and then divide it to the power of 10 that you multiply in last step.
1.25%0.5 -> 125%50

Answer 2

thanks man .

Answer 3

((1.25%0.5)*100=125%50=2)/100=0.02