PlatinumPlan

public class PlatinumPlan extends HealthInsurancePlan{

    double coverage, discount;
    PlatinumPlan(){
        coverage = 0.9;
        discount = 50.0;
    }

    public double getDiscount(){
        return discount;
    }
    //exercise states not to define same method in subclass as well
    public double getCoverage(){
        return coverage;
    }
}