Magento Website

Hi,

I need some work to be done to my website. uk.baggit.com .

Email are not being send out from magento - registration, subscription, order, deliver etc emails.

Decimal & rounding value issues for products and Delivery charges

Responsive design issue for tablets, mobile and browsers

Speed and loading time issues

Other minor quality issues which needs to be fixed .

Please advise your overall costs and also delivery timescale.

Language is PHP and magento.

Also whats your no ?

Thanks
Mathew