Question 1121029
I have to ignore the 'P' in your terms like 'P34,000.00' and 'P130' because the meaning of them is unclear, and therefore have to assume you have omitted the units of money used.

a. the number of calendars and the average cost are represented by symbols x and p(x)
average cost per calendar =total cost/number of calendars
p(x)=(34000+130*x)/x=130+34000/x.

b. if you want to get a nice graph I recommand you take a look at https://www.desmos.com/:
And the result: *[illustration graph].

The point on the function where p(x)=200 is already given. At this point the number of calendars printed is roughly 486.

c. it decreases. You are able to see it from the graph.