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

Step-by-step explanation:

Given

Cora bought 90 feet cable for $\ 25.20$

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

$\Rightarrow \text{Price P=}\dfrac{25.20}{90}\\\\\Rightarrow P=\ 0.28\ \text{per foot}$

for additional 40 feet, the cost is

$\Rightarrow 0.28\times 40\\\Rightarrow \ 11.2$

Thus, Cora pays $11.2 for extra 40 feet