How to calculate additionals costs on cart or checkout

Hello everybody,

I would like to ask how I can I calculate additionals costs on a cart or checkout.

My website offers boxes rental, which is based on a price per week and I am able to calculate it per week only using available options.

Now, the question is if I can somehow create a radio button, checkbox that will multiply rental cost x no.of weeks, which will double costs(2 weeks), triple (3 weeks) and so on and then it will be added up to delivery.

Simply, total cost of rental x 1(1 week) or 2(2 weeks) or 3(3 weeks) or 4(4 weeks) ..+ delivery= total

I figured out how I could get it done be using delivery variables:P For instance I set ‘Default Handling Fee’ 200%, which can double costs but unfortunately I need these options to calculate shipping costs://

So, are there any extensions available that can handle it? Has anyone had similiar problem?

Can shipping options such as Flat Rate , International Delivery be somehow ‘copied’ and implemented in a woocommerce as additonal options of shipment ? as I could use them for calculating x 2 and 3…I am just trying to find out any other possible ways to resolve this issue.

I will appreciate any help:) Thanks.

http://wordpress.org/extend/plugins/woocommerce/