Excel formula to add with conditions

[baidya91]

Please tell me an excel formula to add in following manner:

If a1 = 1640, a2 = a1+65, a3=a2+65, a4=a3+65, a5=a4+65, a6=a5+65 until it reaches 2095
then a7=a6+80.........until it reaches 3135
then next cell=the previous result+100...................until it reaches 3635

 

[MARK858]

Ugly way...

Excel Workbook
	A
1	1640
2	1705
3	1770
4	1835
5	1900
6	1965
7	2030
8	2095
9	2175
10	2255
11	2335
12	2415
13	2495
14	2575
15	2655
16	2735
17	2815
18	2895
19	2975
20	3055
21	3135
22	3235
23	3335
24	3435
25	3535
Sheet2

 

[Kerryx]

=if(a1<2095,min(2095,sum(a1+65)),if(a1<3135,min(3135,sum(a1+80)),if(a1<3635,min(3635,sum(a1+100)),"")))

 

[baidya91]

Thanks a lot