Concept:Undercasting sales means recorded sales are lower than the actual figure, so the correction adds to sales.Explanation:Sales are increased by GH¢1,000.Gross profit is calculated as Sales minus Cost of sales.Since cost of sales is unchanged, gross profit rises by GH¢1,000.Net profit is calculated as Gross profit minus Expenses.Expenses are also unchanged, so net profit also rises by GH¢1,000.Answer:Both gross profit and net profit would increase by GH¢1,000.This corresponds to option B.