Last month when Holiday Creations, Incorporated, sold $37,000$ units, total sales were $$148,000,$ total variable expenses were $$119,880,$ and fixed expenses were $$39,000.$

Required:

What is the$-$company's contribution margin $($CM$)$ ratio?

What is the estimated change in the company's net operating income if it can increase sales volume by $425$ units and total sales by $$1,700?($Do not round intermediate calculations.$)$