Find the total kitchen area first, and then find the area of each brick. Thirdly, use the total kitchen area to meet the brick area, that is, the number of bricks needed. Finally, the number of bricks used × the amount of money per brick is the total cost.

Calculate the kitchen area first: 36×36= 1296 (square decimeter).

Then calculate the area of each brick: 3×2=6 (square decimeter).

Number of bricks: 1296÷6=2 16 (blocks)

The total cost is 216× 7 =1512 (yuan).

Answer: * * * 216 needs tiles, and the total cost is 15 12 yuan.