In the admin console upralveniya should be:
1) All five buttons can be changed. Ie you can make a different set .
We assume no 3-5-7-10-12 and 5-10-12-13-20 and when changing parameters
site should be an automatic calculation of the price.
2) There must be a default selection of discount . That is possible by
expose what value for all projects will be opened at
Visiting the page of the project. In the picture by default now
Example 3 % , and I want to do tomorrow to say the default was
12 %. As well as the parameter to be zero . Ie default
niodnogo button is not pressed , and discounts are not taken into account. A client can
already pushing for a discount , and only after that the price varies .