Last month when Holiday Creations, Incorporated, sold $35,000$ units, total sales were $$140,000,$ total variable expenses were $$100,800,$ and fixed expenses were $$36,400.$

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 $600$ units and total sales $$2,400?($Do not round intermediate calculations.$)$

$\backslash$table$[[1.$ Contribution margin ratio,,$\%$