Roy use sone fourth cup of batter for each muffin. make a list to show the amounts of batter he will use depending on the number of muffins he makes

1 muffin = 1/4 cup of batter
2 muffin = 2/4 cup of batter (or 1/2)
3 muffin = 3/4 cup of batter
4 muffins = 4/4 cup of batter (or 1 cup)
5 muffins = 5/4 cups of batter (or 1 and 1/4 cups)
6 muffins = 6/4 (or 1 and 2/4 cups) (or 1 and 1/2 cups)
and it keeps going
hope it helps!

D. i think it is the savings