Dear sir
the buffer type is overlapping and no of buffer is 13
1.input feature----polygon file
2.output feature class----feature class
3. distances--15, 50 150,300,500,1000,5000,10000,15000,20000,100000,300000
4.Buffer_Unit----meter
5.Field_Name--distance
6.Dissolve_Option---all
7.Outside_Polygons_Only---uncheked