Raffle tickets are being sold for a fundraiser. The function a(n) relates the amount of money raised to the number of tickets sold, n.
It takes as input the number of tickets sold and returns as output the amount
of money raised.
a(n) = 4n - 20
Which equation represents the inverse function n(a), which takes the money
raised as input and returns the number of tickets sold as output?

O A. n(a) = a / 4 +20
O B. n(a) = a / 4 -20
O C. n(a) = a - 20 / 4
D. n(a) = a + 20 / 4

NEED ANSWER ASAP