Question

A plumber charges $30 for a house call and $20 per 1/2 of work. How much will the plumber charge for 4 1/2 hours of work at Mrs. DiMarco's house?

Answer 1

$210

Explanation:

How may half hours in 4.5 hours?

4.5/0.5=9

Each half hour is worth $20.

9*20=180

9 half hours plus house call fee.

180+30=210

Answer 2

210$

Explanation:

30 + (20 * 9) =

30 + 180 = 210

It's 20 * 9 because there is 8 halves in a 4, and an additional half makes it 9 halves.

20 times 9 :)

And, of course, the 30 for the house call to start off with.

Total: 210$