Row wise summation to find out grand total

Hi ,

I have a requirement where i need to find out the grand total from the total field row wise.

Name id project hrs worked from date . . . . . . . . . .hrs worked to date grandtotal

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24.05.2014 24.06.2014

Rahul 123 xyz 8 4 3 7............................. 1

Rahul 123 abc 1 0 1 3 2

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Total 9 4 4 10 3 30

Total is already calculated. I need to find the grand total row wise from total(the one that is highlighted).

Also the from date and to date is given by user so based on that it should be implemented.Please suggest how to implement this.

thanks in advance

Dilit Thakkar