Answer:
The height of a large block is of 12.1 inches and of a small block is of 7.7 inches.
Step-by-step explanation:
This question is solved using a system of equations.
I am going to say that:
x i the height of a large block.
y is the height of a small block.
Taylor uses 4 large blocks and 2 small blocks to make a tower 63.8 inches tall.
This means that:

Simplifying by 2:

So

Natsumi uses 9 large blocks and 4 small blocks to make a tower 139.8 inches tall.
This means that:

Since 




The height of a large block is of 12.1 inches and of a small block is of 7.7 inches.
About $19.16 a year because you do 315-200 which gives you 115 and than you divide that by 6
Do a proportion
60/100= x/54
Cross multiply and divide
54 x 60= 3,240
3,240 divided by 100 is 32.4
Now subtract
54- 32.4= 21.6
Answer is $21.6