Y learns that X (a large public company) will pay a large dividend, and so, before the record date, Y buys one share of X for $100, receives a $50 dividend 20 days later and sells the stock for $50 the next day. What is Y's taxable income from the dividend and the stock sale?

What if, Y buys all the stock of X for $100 and causes X to pay a $50 dividend 10days later and sells the stock for $50 six months later. What is Y's taxable income from the dividend and the stock sale?