The expression for the amount of change he will receive for the groceries is 50-d
Mr Bailey purchased some groceries that cost d dollars
He made payment with a $50 bill
The change he will receive can be calculated by subtracting the cost of dollar bill which is given as d from the amount he paid with which is given as $50
= 50-d
Hence the change he will receive from purchasing the groceries is 50-d
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