In Reply to the Challange

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First Column: Begin Weight
Second Column: % Dropped
Third Columm: End Weight after 1 month

Realistic 3% drop each month
end of every month
180.0 5.4 174.6 April
174.6 5.2 169.4 May
169.4 5.1 164.3 June
164.3 4.9 159.4 July
159.4 4.8 154.6 Aug

Realistic 4% drop each month
end of every month
180.0 7.2 172.8 April
172.8 6.9 165.9 May
165.9 6.6 159.3 June
159.3 6.4 152.9 July
152.9 6.1 146.8 Aug