If '$DO$' is written as '$FQ$' and '$IN$' is written as '$KP$',then how would '$AT$' be written?

If in a code language,$COULD$ is written as $BNTKC$ and $MARGIN$ is written as $LZQFHM$,how will $MOULDING$ be written in that code?

The word $EXPAND$ has been written in four different codes by applying four different rules. Identify the rule applied to the word $MICROWAVE$ to obtain the code $FXDATXJQV$ from the given alternatives.
$EXPAND$ $(a)$ $FYQBOE$ $(b)$ $EPDTCR$ $(c)$ $GYRBPE$ $(d)$ $CWNZLC$
$MICROWAVE$ : $FXDATXJQV$

In a certain code language,'in ba pe' means 'he has won','le ki ba' means 'she has lost',and 'in se pe' means 'he always won'. Which word in that language means 'he'?

In a certain code language:
$(A)$ 'pod najoe' means 'very bright boy'
$(B)$ 'tam nu pod' means 'the boy comes'
$(C)$ 'nu per ton' means 'keep the doll'
$(D)$ 'joc ton su' means 'very good doll'
Which of the following statements can be dispensed with for answering the above question?

In a certain code $GARIMA$ is written as $725432$ and $TINA$ as $6482$. How is $MARTINA$ written in that code?