Hi there can someone help me...
worksheet has 4 colums, column 1 contains full price of article (known
amount), column 2 has tax amount (not always known), column 3 has gratuity
amount (sometimes known), column 4 has total without tax but with gratuity.

Tax, if unknown, is calculated at 7% of amount without gratuity.

What would the formulas be to have my calculations become automatic on input
of full amount?

Thank you