One brand of canned salmon is sold in four different sizes. size a the 7 1 5 -ounce can costs $3.49. size b the 16 1 2 -ounce can costs $6.49. size c the 24 3 4 -ounce can costs $8.49. size d the 30 2 3 -ounce can costs $10.99. what is the unit rate for each size to the nearest cent? if the cost is less than a dollar, put a zero to the left of the decimal point. size unit rate a $ b $ c $ d $ which size is the best buy? explain how you know.