Hi can someone help me wit the problem below

Gabby has a small business. She made a sale of Php150,000 worth of products during its first year. She has set a goal of increasing her business' annual sales by Php30,000 each year for 15 years

1.Assuming her goal is met, how much is the sales of the business during the 7th year? 2.What mathematical model will represent the sales in the nth year?

3.How much is the sales of the business during the 15th year? 4. What is the total sales of the business for its first 15 years?