Please help asap!!! I don't know how to do these

An equity investor in a business expects to receive dividends of $15,000,$20,000,$35,000 and $40,000 over the next four years. She expects to be able to sell her share of the business in four years. She invests $250,000 equity in the business and requires an expected return of 15%. For how much does she expect to sell her share in four years? An investor gives a new firm $300,000 on the condition that he receive a "royalty" of 10% of annual sales. If sales over the next five years are $1,250,000,$1,00,000,$1,500,000,$1,750,000 and $2,000,000, what was the internal rate of return he earned on his investment over these five years? Please express your answer as a percentage