why this question used annuity immediate. please explain to me. which sentences indicating usage. and how to differentiate usage annuity due and annuit immediate from the question why not using annuity due

2.1.13S Chuck needs to purchase an item in 10 years. The item costs 200 today, but its price inflates 4% per year. To finance the purchase, Chuck deposits 20 into an account at the beginning of each year for 6 years. He deposits an additional X at the be- ginning of years 4, 5, and 6 to meet his goal. The effective an- nual interest rate is 10%. Calculate X