... the new total, $1. 19. .99 .20.10$1. 29 Whip adds its total, 10 cents, to the result from Mocha, and returns the final result—$1. 29. 12553DarkRoast returns its cost, 99 cents.4Mocha calls ... public double cost() { return 1 .99 ; }}Starbuzz CoffeeCoffeesHouse Blend Dark Roast Decaf EspressoCondimentsSteamed MilkMochaSoyWhip . 89 .99 1.051 .99 .10 .20 .15 .10public class ... DarkRoast, and returns the new total, $1. 19. 4 .99 .20.10$1. 29 Whip adds its total, 10 cents, to the result from Mocha, and returns the final result—$1. 29. 1255Okay, here’s what we know so...