Use stella software to solve the problem below

Please also include screenshots for the stella software and an explanation

Scenario Description

You are a college student moving into a new house with your $4$ friends. You also have a new part time job of $20$ hours per week that pays shillings $10,000/$hour$.$ Your parents are paying for your tuition and books and contributing shillings $500,000$ per month to your bank account for rent. You are responsible for all the bills and the rest. You estimate about shillings $300,000$ a month for food and groceries for yourself. You also spend about shillings $50,000$ a month on transportation. Clubbing requires $50,000$ shillings per months and $20,000$ shillings a week for your boyfriend$/$girlfriend$.$

The house rent is shillings $200,000$ per month. Your electricity bill is about shillings $20,000$ per month and your cable bill is internet is $50,000$ per month. The rent and the utilities are divided evenly between all residents. There$$s no heating in this house!

How many months will you need to save money to buy a new laptop computer and speakers which cost about shillings $1,500,000?$