Question

A business owner needs to hire a cleaning service for the office. The cleaning company charges $250 for 5 rooms. The office has 12 rooms. An employee did the following math to determine the total cost to clean the office.

Step 1: $250 ÷ 5 rooms = $50 per room

Step 2: $50 × 12 rooms + $250 = $850

Answer: The total cost to clean the office is $850.

What was the employee’s error?

Step 1 should have been 5 rooms ÷ $250 = 0.02 rooms per $1.00.
Step 1 should have been $250 – 5 rooms = $245 per room.
Step 1 should have been $250 × 5 rooms = $1,250 per room.
Step 2 should have been $50 × 12 rooms = $600.
Step 2 should have been $50 + $250 = $300.

Answer 1

Step 2 Should have been $50×12rooms=$600.

How?

• Cost of 5rooms=$250
• Cost of 1room=$250/5=$50

Cost of 12 rooms

$\\ \sf\longmapsto 12(50)=600$

Answer 2

Answer:

Step 2 should have been $50 × 12 rooms = $600.

Step-by-step explanation:

In step 2, there is no need for him to add $250 when the 12 rooms will already cover the cost of the entire job. The cost of 5 rooms was just a reference for us to use to find the cost per room.

50 * 12 = $600

Best of Luck!