Question

profit at output 30
Total cost=100+5x
total revenue=10x
x = the quantity sold or purchased

Answer 1

total Revenue -total cost = profit
10x-100-5x=30
5x=130
x=26
total cost =100+(5×26)=230
total revenue=10×26=260

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Answer 2

y=tc+tr

but profit

=tr-tc

100+5ˣ-10ˣ=30

₋70=₋5ˣ

ˣ=14

tc=100+{14ˣ5}=170

tr=10ˣ14=140

y=140+170

310