Hey. Let me help you on this one.
In order for us to solve this problem, we will need to set up an expression with variable "m" which we can substitute for the month. I will be attaching an image that will show all the work that was done to reach the answer, so make sure to look over it in case you don't get the problem or need extra help with your studies.
First of all, let's write an expression for this problem. We know that Jason had $120 in the beginning of the year. The first month of the year is January, and he decided to place $15 on his account. This trend will continue every month.
Knowing that Jason places $15 every month is very useful. We know that Jason will place $30 in two months, and $45 in three months (in total, of course). Let's write an expression.
In this expression, 120 stands for the initial sum of money, while 15 stands for the monthly additional payment.
Now, we need to determine the amount of money Jason had at the end of the year. At the end of the year, 12 months would pass. We can easily substitute this into the expression we just formed.
Awesome! We now know the total amount of money Jason had at the end of the year.
Answer: The correct answer is D -
