Title says it all, normal maps reward 4 and the one unlocked from the upgrade rewards 7
(Tip: 4 + 4 is 8)
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Tip: it depends on which way you make the calculation. (n+1)*2=2n+2 n*2+1 =2n+1 Do we dislike this? Of course. Are Bungie as dumb as you make them look like? Not in this case as the combination of these upgrades leaves the room for interpretation on how to calculate.
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Normal is 3. Double is 6. You probably have the extra energy upgrade which gives 1 extra.
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Normal maps are three. Double maps are six. The bonus plunder energy adds one.