Number of non negative integral solution of X+Y+Z+W<30. Solve by permutation and combination

8. How many nonnegative integer solutions does the equation Obtain a single number. [+y+z+w = 8 have?

how to calculate permutations

I have a video game related math question involving permutations. In a certain video game, you have 25 characters. Each character has 60 costumes. Each character also has 3 groups of items they can customize, and 30 items in each group, for a total of 90 items for each character. My question is: How many different permutations of costumes and items are available for each character?