=IF(C1="",A1*B1,(100-C1)/100*A1*B1)
A1: Number of items
B1: Price per item
C1: Discount (percent)
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=IF(C1="",A1*B1,(100-C1)/100*A1*B1)
A1: Number of items
B1: Price per item
C1: Discount (percent)
This post is also available in Deutsch.