TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: what is the units digit of 26 ! + 50 ! + 4 ! + 4 ! ?

SOLUTION: 8

PROBLEM: Problem: last year elaine spent 20 % of her annual earnings on rent . this year she earned 35 % more than last year and she spent 30 % of her annual earnings on rent . the amount she spent on rent this year is what percent of the amount spent on rent last year ?

SOLUTION: 202.5

PROBLEM: Problem: a student travels from his house to school at 10 km / hr and reaches school 2 hours late . the next day he travels 18 km / hr and reaches school 1 hour early . what is the distance between his house and the school ?

SOLUTION:
67.5