Help for brainliest please

Juanita wade's new car has an msrp of $28,902.11 including title and processing fees. the premier package which includes surround sound and dvd player costs three times the amount of the in-style package which includes leather seats and select wheels. the total cost of her new car was $34,290.08 which included the 6.5% sales tax. find the cost of the premier package to the nearest cent.

The price of one share of a company’s stock declined $13.89 every day for 2.5 days what was the stocks total decline in price

Me because i don't understand how to do it.: )