Sports Inn Bowling Lanes has set a pricing objective to maintain a markup of $10.50 on lane rentals. The cost of providing the rental is $4.00. Every day, ("Early") bowlers before 5 p.m. pay half-full price while ("twilight") bowlers after 5 p.m. pay full- price equaling $15.00. Typically, 75% of the bowlers are "twilight" bowlers. What regular price and sale price should Sports Inn set to meet its pricing objective