Yii 2 online store - refining the system of discounts

Requires a developer with development experience on Yii2 to refine the system of discounts in the online store.
The payment system is hourly, fact-down. The task for 80-100 hours, it is desirable to meet in 3 weeks. The budget is approximate.

In the responses, please specify 1 rate per hour, 2 possible work schedules and number of hours, which can be given per day, 3 - a link to a github or repository with examples of your work.