Question

(Linear) a person opened a bank account at the begining of the year. Her initial deposit wa $120, and after that she deposited the same amount once a month for 12 months. At the end of the 12 months, there was $1,860 in the account. How much did she deposit each month?

Answer 1

$145 dollars.

You know she started with $120, so subtract this from $1,860
You should get:
$1,740

There are 12 months in a year, so in order to find out how much she deposited evenly EACH month, divide $1,740 by 12.
You should get:
$145

Answer 2

Yes, @blurbendy is correct, she deposited 145$ per month.