For light beam B, the observer on Earth is movimg towards the source, and therefore the velocity of the light perceived in this case is larger than for an observer at rest with respect to the ether:
As a fraction of c, this is .
For , this gives (See also table 10.1). This means that for every day that passes for you on your rocketship, 7.1 days pass for the observers on Earth. When you return after one of your days, 7.1 days have passed for the observers on Earth. Thus, you have aged by one day, while the observers on Earth have aged by 7.1 days, i.e. by 6.1 days more than you.