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At cheap rates the sugar is sold.
The given sentence is a very rare case of active voice. It will be converted into the passive sentence as shown below:
Sugar is sold very cheaply.
The active voice of the given sentence is in Simple Present Tense; so passive will also be in the Simple Present.
We don't need to put any 'by+ object' in such a case as this one.
the develop mission of duty is a very important in our life if it us to coins