Brian delivers pizza for a local pizzeria. Each night he makes 60%of his deliveries in under ten minutes, 25%of his deliveries in exactly ten minutes, and 15% of his deliveries in over ten minutes. Brian typically earns $10 in tips if the pizza is delivered in under ten minutes, $5 it if is delivered in exactly ten minutes, and $2 it if is delivered in over ten minutes. If he improves his delivery times so 75%of his deliveries are made in under ten minutes, 20%of his deliveries are made in exactly ten minutes, and 5%of his deliveries are made in over ten minutes, how much more can Brian expect to make in tips each night?