in part c why would you change the 0.5% to 0.005 and the 49.5% to 0.495when calculating the probability of having a sickle-cell anemic and albino

in part c why would you change the 0.5% to 0.005 and the 49.5% to 0.495 when calculating the probability of having a sickle-cell anemic and albino child? when converting percentage to decimals aren't you just removing the percentage sign? because when converting decimal to percentage you're just placing a number over 100. So wouldn't i just keep the numbers 0.5 and 49.5, multiply them and have a probability of 24.75??