Mya bought some clothes for her little brother. She paid $20.95 for a pair of jeans and $16.95 for a shirt. She also paid a 9.5% in sales tax. Her brother said Mya paid $47.40 for everything including tax. Is Mya's brother correct? Prove him right or wrong by explaining in detail how to:

Total the items being purchased
Accurately calculate sales tax
To add the sales tax to the cost of the clothing
Prove her brother right or wrong
State the correct answer