Billboards

An advertising panel has the shape of a cylinder. The circumference of the base is 10 m, the height of the cylinder is 4 m.
a) How many CZK per year will we pay to rent the lateral surface of the cylinder, if 1 m² of advertising space costs 1,500 CZK per month?
b) How many posters measuring 60 cm × 80 cm can be glued onto the lateral surface at most, if we glue all of them in portrait orientation?
c) What percentage of the advertising space will remain unused?

Your answer:

Kc


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