noun
1
BAD : They make all their money from the selling of vegetables.
GOOD : They make all their money from the sale of vegetables.
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To refer to the act of selling something, use the sale of : 'The money that comes from the sale of these drugs is used to buy weapons.'
2
BAD : The first proposal would reduce the selling figures of the local shops.
GOOD : The first proposal would reduce the sales figures of the local shops.
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sales = the number of things that are sold by a company: 'They've recruited a top advertising agency to help boost sales.' 'Last month's sales figures are very pleasing.'