plan-usage-net-mrr.rb

#
# August 2017
#  - Customer 2 renewal (+$35 plan, -$40 usage,  -$5 net) overall contraction
#  - Customer 3 renewal (+$50 plan, -$40 usage, +$10 net) overall expansion
#  - Customer 4 renewal (-$50 plan, +$30 usage, -$20 net) overall contraction
#
#               August
#    expansion
# ------------
#         plan      85
#        usage      30
#          net       ? (currently we would show +10) but that would be confusing because the sum of plan and usage expansion is not equal to net expansion.
#
#  contraction
# ------------
#         plan     -50
#        usage     -80
#          net       ? (currently we would show -25)
#
#   net_growth
# ------------
#         plan      35
#        usage     -50
#          net     -15