Itc reversal tn vat, cst purchase, cst sale

sir

We are a manufacturer of Paper board in Tamilnadu. Registered TN manufacturer. Our purchase/sale composition per month is roughly as below

Purchase

TN VAT 5% purchase  basic value  Rs300000/-

TN VAT 14.5% purchase basic value Rs 10000/-

CST purchase against C-form at 2% ,  basic value Rs250000/-

Sales

TN Vat 5% sale          Rs340000/-

CST sale @ 2% against C-form   Rs320000/-

please advice me 

1) What is the ITC available in this transaction. Pl provide the formula/format , to calculate ITC

2) How to calculate, any reversal of ITC.

3) How much tax amount, we had to pay as per above transaction, to TN government

thanks

Prabu

Coimbatore