When purchasing a new bike, 38% of customers also buy a new helmet. If the bike shop sells 105 bikes next month, about how many customers are predicted to also buy a new helmet?
Assuming that all the customers are the ones who got the bikes (so 105), all you need to do is .38 x 105, which is 39.9. you cannot have .9 of a person, so you round that up to 40.
