Question 1062172
The best representation I can make is 9 octagonal tiles to 4 square tiles, as seen here: <p><a href="https://photos.google.com/photo/AF1QipMk5B2y5tglB3ugFm0yZz25ls4f2NXP3pQ-GxvQ">click here</a></p>

The total area for this combination of tiles is: (9 x 2(1+&#8730;2)3²) + 4(3²)=79.45 cm².  The total area for the countertop is 83 x 203=16849 cm².
16849 / 79.45=212
(a) The number of tiles needed:
212 x 9=1908 octagonal tiles
212 x 4=848 square tiles
(b) 1908 x .78=1488.24
    848 x .55=466.4
    1488.24+466.4=$1954.64 total cost to cover the countertop. &#9786;&#9786;&#9786;&#9786;