A book salesman is paid a commission of $760 when he sold $19,000 worth of books in a month. What was the rate of commission paid for that month?

Maria makes money by commission rates. If Maria sold $23000 worth of items this month, and her total salary was $3450 this month, what was her commission rate?

Tiffany makes money by commission rates. If Tiffany sold $27000 worth of items this month and her monthly salary is $5670, what % does she get from what she sells?

If Peter sold $55000 worth of items this month and his salary for the month was $3300, what percent of everything he sells does he earn?

Cindy makes $3000 a month by commission rate. If Cindy sold $30000 worth of items this month, what percent of everything she sells does she earn?

Paul made $456 as a vendor selling items this month. If paul sold $7600 worth of items this month, How much commission did he make on all of his sales?