Question

Cora bought 90 feet of cable for ​$.25.20. She needs 40 more feet. If the unit price is the​ same, how much will she pay for the extra 40 feet of ​cable?

Answer 1

Answer: $11.2

Explanation:

Given

Cora bought 90 feet cable for
`\$25.20`

So, the price of a foot is the division of rate and length

`\Rightarrow \text{Price P=}(25.20)/(90)\\\\\Rightarrow P=\$0.28\ \text{per foot}`

for additional 40 feet, the cost is

`\Rightarrow 0.28* 40\\\Rightarrow \$11.2`

Thus, Cora pays $11.2 for extra 40 feet