Percentages are parts of 100, so to convert 0.8% to a decimal, we just divide 0.8 by 100.
0.8 / 100 = 0.008
Dividing by 100 is the same as moving the decimal place two times to the left.
h(x) = (x-1 ) /2 ...........
X = k/y
4 = k/10
k = 4 x 10 = 40
Thus, x = 40 / y
90 = 40 / y
y = 40/90 = 4/9