Options:
A.
B.
C.
D.
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Earlier discussion
2 older comments kept for context.
Richard Paul
The function is already given by:
Qs=80-0.7p
At price of N40,then
Qs=80-(7/10)×40
Qs=80-(7×4)
Qs=80-28
Qs=52 tons
Blessing
The correct answer is A
Qs=80+0.7p
Qs=80+0.7(40)
Qs=80+28
Qs=108