Question

John wants to fence a square field whose side length is $20.95m$ with barbed wire. If the cost of the barbed wire is $\$0.345$ per meter. Find the total cost of the barbed wire required for fencing the entire square field.

• A. $\$2891.10$
• B. $\$28.9110$
• C. $\$289.110$
• D. $\$2.89110$

Answer 1

The correct option is B $\$28.9110$

Detailed step-by-step solution:
Side length of a square field $=20.95m$
Total perimeter of the square field $=4\times$side length.
$=83.8m$
Price of 1 m of barbed wire $=\$0.345$
Total cost of the barbed wire required by John $=0.345\times 83.8$


The number at the top has $3$ digits to the right of the decimal.
The number at the bottom has $1$ digit to the right of the decimal.
The product has $3+1=4$ digits to the right of the decimal, i.e., $28.9110$
Therefore, the cost of the barbed wire required for fencing $=\$28.9110$ .
Hence, option A is correct.