Ivan runs a small independent movie theatre in Scarborough, which presently attracts 1,200 customers per week at a ticket price of $8. His customer base comprises 1,000 adult customers and 200 seniors. He would like to increase his total revenue by practising price discrimination. He knows that the demand by adults is fairly inelastic and that a change in the admission price of $1 would change the quantity by 80 customers. He also recognizes that the demand by seniors is fairly elastic and a $1 change in the price would result in a change of 50 customers.