Cost calculations

Gemfile.lock

@@ -1,36 +1,37 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (5.1.5)
-      activesupport (= 5.1.5)
-    activerecord (5.1.5)
-      activemodel (= 5.1.5)
-      activesupport (= 5.1.5)
-      arel (~> 8.0)
-    activesupport (5.1.5)
+    activemodel (7.0.1)
+      activesupport (= 7.0.1)
+    activerecord (7.0.1)
+      activemodel (= 7.0.1)
+      activesupport (= 7.0.1)
+    activesupport (7.0.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (~> 0.7)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
-    arel (8.0.0)
-    concurrent-ruby (1.0.5)
-    daemons (1.2.6)
-    et-orbi (1.0.9)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+    concurrent-ruby (1.1.9)
+    daemons (1.4.1)
+    et-orbi (1.2.6)
       tzinfo
-    i18n (0.9.5)
+    fugit (1.5.2)
+      et-orbi (~> 1.1, >= 1.1.8)
+      raabro (~> 1.4)
+    i18n (1.8.11)
       concurrent-ruby (~> 1.0)
-    mail (2.7.0)
+    mail (2.7.1)
       mini_mime (>= 0.1.1)
-    mini_mime (1.0.0)
-    minitest (5.11.3)
-    mysql2 (0.4.10)
-    rufus-scheduler (3.4.2)
-      et-orbi (~> 1.0)
-    serialport (1.3.1)
+    mini_mime (1.1.2)
+    minitest (5.15.0)
+    mysql2 (0.5.3)
+    raabro (1.4.0)
+    rufus-scheduler (3.8.0)
+      fugit (~> 1.1, >= 1.1.6)
+    serialport (1.3.2)
     state_pattern (2.0.2)
-    thread_safe (0.3.6)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.4)
+      concurrent-ruby (~> 1.0)
 
 PLATFORMS
   ruby
@@ -45,4 +46,4 @@ DEPENDENCIES
   state_pattern
 
 BUNDLED WITH
-   1.16.1
+   2.1.4