If I spend $102 dollars in 2.5 months, how much will I spend in 4 months if my spending habits don't change?

163.2

Step-by-step explanation:

When you divide 102 by 2.5 that gives you 40.8. So you spend 40.8 dollars a month. When you multiply 40.8 dollars by 4 months you get 163.2 dollars.