Suppose that a worker earns x$ every other month. In September he earns 5x. We have that his total earnings are 11*x +5x (Eleven months income plus September). Hence 16x is the amount of total earnings. The ratio of earnings in September to the total earnings is [tex] \frac{5x}{16x} = \frac{5}{16} [/tex]=0.3125. Hence, 31,25% of his earnings where accrued in September.
