Question

Nathan is a plumber. He charges a fixed fee of $50 for a house visit and $20 per hour when he has to perform emergency repairs. Sydney calls Nathan to repair a flooded bathroom and he charges her $130. How many hours did Nathan spend fixing the problem?​

Answer 1

Answer: 3.5 hours

Step-by-step explanation:

$50+20=

$70    1 hour

$70+20=

$90    2 hours

$90+20=

$120   3 hours

$120+10  (add ten because half an hour) =

$130