Group by results for a Summation

Hi,

I have a report with a view currently in a table (need to know if Pivot Table is a better option for this)

Record Name	Due Date	New Due Date	Days from Original Date	Amount
TEST Case1	1/1/2014	1/5/2014	4	1200
TEST Case2	1/19/2014	1/23/2014	4	1300
TEST Case3	2/20/2014	2/21/2014	1	900
TEST Case4	2/21/2014	2/23/2014	2	1489

I need a SUM of the Amount column grouped by Days from Original Date.

So

Days =4 Amount = 2500 (1200+1300)

Days= 1 Amount = 900

Days= 2 Amount = 1489

and I want this SUM on the graph

X-axis = Days from Original Date

Y-axis =  SUM (Amount by Days)

Do I need a pivot?

I need the Sum visible in the table as sub total as well as plotted on the graph