An operator of a ski resort is considering offering price reductions on weekday ski passes. At the normal price of \(€ 50\) per day, 300 customers are expected to buy passes each weekday. At a discounted price of \(€ 40\) per day, 450 customers are expected to buy passes each weekday. The marginal revenue per customer earned from offering the discounted price is closest to:

A. \(€ 20\).

B. \(€ 40\).

C. \(€ 50\).