A electrical contractor charges $5,000 to install 100 recessed light fixtures. If 10 more fixtures are added, bringing the total to 110, what should be charged to install 110 fixtures?

A electrical contractor charges $5,000 to install 100 recessed light fixtures. If 10 more fixtures are added, bringing the total to 110, what should be charged to install 110 fixtures?

• A. $5,200
• B. $5,500
• C. $6,000
• D. $5,800

Answer: (B)

Pricing is based on a constant per-fixture rate. From the original job, the rate is $5,000 for 100 fixtures, so $5,000 ÷ 100 = $50 per fixture. For 110 fixtures, multiply by 110: 110 × $50 = $5,500. So the charge should be $5,500. The other amounts would require changing the per-fixture rate or adding fixed charges, which isn’t indicated here.

Pricing is based on a constant per-fixture rate. From the original job, the rate is $5,000 for 100 fixtures, so $5,000 ÷ 100 = $50 per fixture. For 110 fixtures, multiply by 110: 110 × $50 = $5,500. So the charge should be $5,500. The other amounts would require changing the per-fixture rate or adding fixed charges, which isn’t indicated here.