The task is to generate the correct answer for a given math problem.
--------
Question: Problem: the perimeter of a triangle is 36 cm and the inradius of the triangle is 2.5 cm . what is the area of the triangle

Answer: b ) 45


Question: Problem: robert ' s salary was decreased by 20 % and subsequently increased by 20 % . how much percentage does he lose ?

Answer: 4 %


Question: Problem: what is the units digit of 26 ! + 50 ! + 4 ! + 4 ! ?

Answer:
8