@ APR2013APP Excel sheet check canadiancoops user. It should give you a rough idea.
https://docs.google.com/spreadsheets/d/1Emq25ueiJJ9coxst2YC7sszqAhFJi_B3r2Q1sd6Y29s/edit?usp=sharing
https://docs.google.com/spreadsheets/d/1Emq25ueiJJ9coxst2YC7sszqAhFJi_B3r2Q1sd6Y29s/edit?usp=sharing