Real World Application of Precents

1.) A baseball pitcher won 80% of the games he pitched. If he pitched 35 ballgames, how many games did he win?

2.) An electrician worked 7 months out of the year. What percent did he work?

3.) The price of gas went from $2.10 per gallon to $6.50 per gallon. What is the increase in percent?

4.) Timmy invested $30,050 into an account with an 8% interest. How much interest will Timmy have after 10 years?