Help for sec 44 ad

I own a proprietor business of electrical goods - wholesale and retail.

for financial yr 20011-12

my turnover is rs 26 lakhs

my net profit is rs 1,60,000.

Is it compulsory to file return as per sec 44 ad ?

I do not want that section to be applicable to me.

my other income is interest of rs 1,00,000.

So, can I opt for normal tax provisions - 

I - income from business - 1,60,000

II - interest income            - 1,00,000

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total income                         - 2,60,000

no deductions

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total taxable income      - rs 2,60,000

and file returns as per income of rs 2,60,000

is it compulsory to opt for sec 44 ad ?

pls revert with solutions.

thanks