Sum of numbers in an interval (2) X39837

Statement

Write a funcion @sum_interval(a, b, n)@ that receives two integers $a,b$ such that $0\le{a}\le{b}$ , and a natural $0\le{n}\le{9}$ , and returns the sum of all integers in $[a,b]$ whose last digit is $n$ .

Sample session

>>> sum_interval(5,10,8)
8
>>> sum_interval(5,10,3)
0
>>> sum_interval(1,100,6)
510
>>> sum_interval(10,20,0)
30

Information

Author: ProAl
Language: English
Official solutions: Python
User solutions: Python