The price P for demand D is given as
P=183 + 120D –3square D
find D for which price
is increasing .
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Price function P is given by
P=183+120-3D^2
Differentiating w.r.t D
dP/dD=120-6D
If price is increasing then we have dP/dD>0
Therefore 120-6D>0
= 6D<120
= D<20
Therefore, the price is increasing for D<20
Hope you understood
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