Question

The water company has a different monthly pricing plan for residential customers than for business customers. For each pricing plan, cost (in dollars) depends on water used (in hundreds of cubic feet, HCF), as shown below.

Answer 1

(a) For an HCF of 22, the residential plan costs $44 and the business plan costs $36.

• So, the business plan costs $8 less.

(b) $14, business plan.

• The plans cost the same when the graphs intersect.
• After $14, the business plan graph is lower than the residential plan graph, meaning the business plan will cost less.