Answer: Option 'C' is correct.
Step-by-step explanation:
Since we have given that
Original price of a telescope = $400
Mark up percent = 32%
So, Price after mark-up is given by
[tex]400\times \frac{100+32}{100}\\\\=400\times \frac{132}{100}\\\\=400\times 1.32\\\\=\$528[/tex]
Hence, Option 'C' is correct.