manager.cs

public class Manager : ClaimApprover
{
    public override void ApproveRequest(Claim claim)
    {
        if (claim.amount >= 100 && claim.amount <= 1000)
        {
            System.Console.WriteLine($"Claim reference {claim.Id} with amount {claim.amount} is approved by Manager");
        }
        else if (claimApprover != null)
        {
            claimApprover.ApproveRequest(claim);
        }
    }
}