To find the constant part of D, we can subtract the variable part of D from the total value of D when W is at its maximum value:
Constant part of D = D - Variable part of D
Constant part of D = 115 - 625
Constant part of D = -510
Therefore, the constant part of D is -510.
To find the variation of D with respect to W, we can subtract the constant part of D from the total value of D when W is at its maximum value:
Variable part of D = D - Constant part of D
Variable part of D = 625 - (-510)
Variable part of D = 625 + 510
Variable part of D = 1135
Therefore, the variable part of D is 1135.
So, we can say that D is partly constant (-510) and partly varies with W (1135).
D is partly constant and partly varies with W,
D=115 when W=1150 and D=625
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