Effective August 7, 2014 Negative Boost Effects On The Opposite Element Were Removed 
Calculating Earnings Summary
Each individual boost is calculated by taking the previous result and multiplying it by 1.2 (gpm x 1.2^{y}) gpm = dragoncash per minute with no boosts y = number of positive boosts

Calculating Earnings With Positive Element Boosts
Boosts each provide an increase of 20% to the earning rates of dragons of the same element that are housed on the island that the boost is placed on. Depending on the boost and dragon placement, a dragon's earnings rates can be affected in a positive way. Boosts do not affect the epic dragons or any of the gemstone dragons at this time. To calculate the earning rate of a dragon, the player will need to determine how many boosts are affecting that dragon. Then, the player will need to add that amount from his/her dragons' earnings. The effects of one positive boost would be calculated as: 100 + (100*20%) = 120 It is important to note that the effects of boosts are cumulative, meaning that the percentages are calculated in succession.
If a dragon's base earning rate is 100, and was then affected by two positive boosts, the calculation would be: 100 + (100*20%) = 120 > 120 + (120*20%) = 144
If a dragon's base earning rate is 100, and was then affected by three positive boosts, the calculation would be: 100 + (100*20%) = 120 > 120 + (120*20%) > 144 + (144*20%) = 172.8
If a dragon's base earning rate is 100, and was then affected by four positive boosts, the calculation would be: 100 + (100*20%) = 120 > 120 + (120*20%) > 144 + (144*20%) > 172.8 + (172.8*20%) = 207.36
The generic formula to follow is: The player simply needs to place the appropriate number of positive boosts into the formula for their given situation. (gpm x 1.2^{y}) gpm = dragoncash per minute with no boosts y = number of positive boosts

Previous Calculating Method With Positive and Negative Boosts
Boosts each provide an increase of 20% to the earning rates of dragons of the same element, and a decrease of 20% to the earning rates of dragons of the opposite element, that are housed on the island that the Element Boost is placed on. Depending on Boost and dragon placement, a dragon's earnings can be affected in both positive and negative ways. Boosts do not affect the Epic Dragons or any of the Gemstone Dragons at this time. To calculate the earning rate of a dragon, the player will need to determine how many Element Boosts are affecting that dragon, and whether the boosts are positively or negatively affecting the dragon. Then, the player will need to add or subtract that amount from your dragons' earnings. The effects of one positive OR one negative boost would be calculated as: 100 + (100*20%) = 120 100  (100*20%) = 80 It is important to note that the effects of Boosts are cumulative, meaning that the percentages are calculated in succession. If a dragon's base earning rate is 100, and was then affected by two positive boosts, the calculation would be: 100 + (100*20%) = 120 > 120 + (120*20%) = 144 Another important fact is that it doesn't matter if the positive Boosts are calculated first and then the negative Boosts are calculated from that total or vice versa. What matters is that one positive Boost does NOT simply cancel out one negative Boost. We will use the previous example again to illustrate calculating two positive Boosts and one negative Boost: 100 + (100*20%) = 120 > 120 + (120*20%) = 144 > 144  (144*20%) = 115.2 (round to 115)
100 + (100*20%) = 120 > 120 + (120*20%) = 144 >. 144  (144*20%) = 115.2 > 115.2  (115.2*20%) = 92.16 (round to 92)
Dragon's base earning rate + positive Boost #1 + (positive Boost #1*positive Boost #2)  negative Boost #1*(positive Boost #1*positive Boost #2)  negative Boost #2*(negative Boost #1*positive Boost #1*positive Boost #2) = actual earning rate The player simply needs to place the appropriate number of positive and negative boosts into the formula for their given situation. (gpm x 1.2^{y}) x 0.8^{z} gpm = dragoncash per minute with no boosts y = number of positive boosts z = number of negative boosts

Dragon Earning Rates Tables
The following page has tables of the earning rate per minute each dragon earns without boosts. Use this page to apply your Boost Calculations to:
Notes
 Opposite dragons do not have any positive boosts. If both dragon boosts of opposite element are on the same island, it would make the earning rates of the opposite dragon to be lower.
 If both boosts are on the same island it would be less of a negative effect on the opposite dragon than only having one of them on the island.
Dragons  Croisements  Oeufs  Bâtiments  Iles  Habitats  Décorations  Amis 