The CtrlD shortcut fills data down or to the right through all selected cells. Now to change the decimal to a percent multiply the number by 100. Lets look again at the formula Bob used to calculate his selling price.
To find the increase or decrease multiply the rate by the original amount x.
The original cost was 600. Percentage Change D V V 1 100. The original cost was 600. New_value - original_value original_value 100.