#major cost = c
#vistors = v
#Subscription Revenue = s
#AD Revenue = a
#income = n

def calculator(v):
...     c = 70000+30000+50000
...     s = v*10/100*15
...     a = v*8/10
...     n = s+a-c
...     return(n)
... ^D
calculator(40000)
-58000.0
calculator(60000)
-12000.0
calculator(80000)
34000.0 

