Dot Company sells a product for $$225$ per unit. Its market share is $20\%.$ The marketing manager feels that the market share can be increased to $30\%$ with a reduction in price to $$195.$ The product is currently earning a profit of $$36$ per unit. The president of Dot Company feels that the $$36$ profit per unit must be maintained. What is the original cost per unit?

$$$$225$

$$195$

$$159$

$$189$