Calculation:

A company manufactures two products. Each unit of product X requires 10 machine hours and each unit of product Y requires 4 machine hours. The company's productive capacity is limited to 180,000 machine hours. Each unit of product X sells for $15 and has materials costs of $7. Each unit of product Y sells for $8 and has materials costs of $3. Each machine hour costs $0.50.

Only considering costs, if the company wants to maximize profit,how many of unit Y should be made? Use only numbers to answer (no commas or $ signs). You may use decimals.