Please help me if you can. If possible please write how you got the answer so I can remember it next time I get a question like this.

Step-by-step explanation: ༼ つ ◕_◕ ༽つ

So what I'm thinking right. If it costs my pal bob $0.25 for each cupcake and an additional $15 per month we will probably need to variables. So check it

Our positive when we make money is when bob sells cupcakes right? but our negative where bob is spending his money is the $0.25 it cost per cupcake and the $15 a month he also has to pay for expenses

$1.50c-$0.25c-$15.00m

c represents the amount of cupcakes while m represents each month

So if Buddy Boy Bob sold 85 cupcakes in one month lets try to use our equation to solve for profit shall we.  

$1.5(85)-$0.25(85)-$15(1)= Bob made about $91.25