Well there are 6 toppings. For one person to select sausage, it is

. For two people, multiply them together and the probability is
Jerry bud the 4 pack is better
5/8 is a rational number because 5/8 as a percentage is 62.5. As long as the number doesn't go on forever without any patterns, it will be a rational number. If it does go on forever and doesn't have a pattern then it is an irrational number.
It's January, they have till July => 6 months including January
half of $8000 is $4000 in 6 months
4000/6 = $666.66 per month
Johnny should save that much money each month
True.
Since

,

and the solutions are decreasing functions.