Question: 
Write a function to round the given number to the nearest multiple of a specific number.


Model's Code:
def round_num(n, multiple):
    return round(n / multiple) * multiple



Sample Correct Code:
def round_num(n,m):
    a = (n //m) * m
    b = a + m
    return (b if n - a > b - n else a)


Asserts:
assert round_num(4722,10)==4720
assert round_num(1111,5)==1110
assert round_num(219,2)==218


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: FAIL: AssertionError()

Test 375 of 974: 271/375 (72.26666666666667%): failed