Indeed, for some gems, such as diamonds, the price per carat can increase exponentially as the gem size increases. Therefore, a 1 carat stone may cost $1,000 while a 2 carat stone may cost $4,000. This means that good quality sapphires and rubies in larger sizes tend to have a much higher price per carat.
Re: Convert positive # to negative. Hi, if you positive number is in A1, use the following formula to convert it to a negative number =A1*-1 Time values can not be negative. Microsoft MVP http://www.teylyn.com Twitter: http://twitter.com/IngeborgNZ. Microsoft MVP.
In Excel, the SUMIF function can help you to add up only the positive values or negative values. You can apply this formula as this: 1. Type this formula =SUMIF($A$1:$D$7,>0) into a blank cell, see screenshot: 2. Then press Enter key, and just all of the positive numbers have been added up. Notes: 1.