diff --git a/app/controllers/api/pm/sprint_issues_controller.rb b/app/controllers/api/pm/sprint_issues_controller.rb
index 9ef5f911e..0e5180327 100644
--- a/app/controllers/api/pm/sprint_issues_controller.rb
+++ b/app/controllers/api/pm/sprint_issues_controller.rb
@@ -19,12 +19,12 @@ class Api::Pm::SprintIssuesController < Api::Pm::BaseController
     data = []
     curren_issues =  @issues.group(:status_id,:due_date).count
     total_count = @issues.count
-    cardinality = (total_count / time_count).to_f
+    cardinality = BigDecimal.new(total_count) / BigDecimal.new(time_count)
     time_count.times do |x|
       e_time = start_time + x
       completed = curren_issues[[5,e_time]].to_i + curren_issues[[3, e_time]].to_i - @issues.where(pm_issue_type: 3, status_id: 3).size
       total_count = total_count - completed
-      data << {time: e_time, undone: total_count, completed:completed, base_number: (cardinality * (time_count - x))}
+      data << {time: e_time, undone: total_count, completed:completed, base_number: (cardinality * (time_count - x)).to_f.round(2)}
     end
     render_ok(data: data)
   end