Excel Equation

[Legacy 359487]

Please forgive me, I am not a mathematician, so this simple equation has me stumped how to put it in excel.
A1 is -15% and B1 is 41%. How can I add these to show the overall increase?

October was 7,074
November was 6012
% of change is -15%

November was 6012
December was 8488
% of change is 41%

 

[cnestg8r]

8488/7074 = 1.20 or 20% increase

 

[Dave Patton]

Excel 2010
	A	B	C	D
2	October	7,074
3	November	6,012	-15.0%
4	December	8,488	41.2%	20.0%
5
2e

Cell Formulas
Range	Formula
C3	=(B3-B2)/B2
C4	=(B4-B3)/B3
D4	=(B4-B2)/B2

 

[Legacy 359487]

Thank you very much!