How to find maximum if second derivative test is inconclusive?

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265

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.

Which is the best estimate of the product of 0.9 x 0.88? 0 0.25 0.5 1