Help with this multi-part scenario please?

Assume U.S 2018 tax rules apply.

Gusto Cars, Inc. has been having a terrible year this year. In the current year, they are scheduled to make only $1.5 million net income, but the heads of the company realize this is primarily due to an accounting change costing them roughly 30 million in income. Sales are going well and the company expects to rebound from this going forward, however, Gusto has held a constant 3.5% payout on its dividend, and without a significant market drop, this means they will have to pay out roughly 5 million in dividends. They have accumulated earnings and profit of 20 million.

a. What will be the tax effect to shareholders assuming the entire dividend is paid out?

b. Assume the same facts above, but the company has no accumulated earnings and profits. Also, assume all shareholders have a sufficient basis in their stock.