Final answer:
Using the constant of proportionality calculated from initially given inversely proportional values x=0.8 and y=0.25, a new value of y is determined for x = 0.125, resulting in y=0.2.
Step-by-step explanation:
The relationship given indicates inversely proportional behavior between y and x. To find a new value of y when x changes, we use the initial conditions to determine the constant of proportionality. Given that x=0.8 and y=0.25, we calculate the constant as k = xy which equals 0.8 * 0.25 = 0.2. Now, when we have the new condition 0.125x = 0.125, we need to first find the new value of x which is 0.125 / 0.125 = 1. Then we use the constant to find the new value of y by y = k / x, hence y = 0.2 / 1 = 0.2. Therefore the correct answer is 0.2, option not listed.