please... sama cara caranya. hari ini dikumpul

f(x.y) = f(x) / y
f(50) = 12
f(60) = ?

f(50) = f(10.5)
f(10.5) = f(10) / 5
f(10) / 5 = 12
f(10) = 60

f(60) = f(10.6)
f(10.6) = f(10) / 6
f(10) / 6 = 60 / 6 = 10