How to achieve maximum sales profit with less cost?

We can achieve maximum sales profit by using the foll. techniques:

1) increasing the selling price

2) reducing the controllable costs

3) periodical review of costs to reforecast the budget

4) minimizing the rework of job with eperienced staffs

5) shortening the period by rescheduling

by eliminating un-necessary work i.e. the non-value added activities etc, reducing material handling