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s(p)= 3000/2p+10
:
Assume you mean:

:
To solve for p

= 0
:
Multiply equation by 2p and you have;
3000 + 2p(10) = 0
:
20p = -3000
:
p =

:
p = -150
:
Substitute -150 for p in the original equation, confirm the solution