Note that to get the result shown as a percentage it is necessary to set the cell containing the result to have percentage formatting. Then type the following formula. In Excel for Mac you dont need the parenthesis.
If the resulting value is not formatted as a percentage then we can format that cell and get the value in percentage.
In cell B3 divide the second years sales 59863400 by the first year 48500000 and then subtract 1. Then type the following formula. Here E1 First experimental value and E2 Second experimental value. The excel formula for percentage is Portion Days Total Days 100.