Question: 
Write a function to calculate a dog's age in dog's years.


Model's Code:
def dog_age(human_years):
    if human_years <= 2:
        return human_years * 10.5
    else:
        return 21 + (human_years - 2) * 4



Sample Correct Code:
def dog_age(h_age):
 if h_age < 0:
 	exit()
 elif h_age <= 2:
	 d_age = h_age * 10.5
 else:
	 d_age = 21 + (h_age - 2)*4
 return d_age


Asserts:
assert dog_age(12)==61
assert dog_age(15)==73
assert dog_age(24)==109


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 264 of 974: 189/264 (71.5909090909091%): success